JP2010218014A - File display device and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow a reference person to easily comprehend update performed to a file in the past. <P>SOLUTION: A file display device displays a rough image representing rough contents of a layout or the like of a display target document and clearly indicating an update part in an overlooking symbol 150, and displays detailed contents inside a content display window 154. In the overlooking symbol 150, a height direction is set as a temporal axis direction. When a date of a display target is changed by changing a position of a time slider 152, the file display device displays the rough image representing the contents of the display target document at the date corresponding to the position of the slider 152 and clearly indicating the update part in a height position corresponding to the date of the display target in the overlooking symbol 150. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a file display device and a file display program.

  In Patent Document 1, the user can instruct movement to an arbitrary viewpoint in a virtual three-dimensional space where each data of the database is displayed as a list of reduced images. There is disclosed a technique for visualizing the contents of individual data files and the relationship between each data so that data management and retrieval of information required by a user can be easily performed.

  Further, Patent Document 2 reads identification information and coordinate information described on a print medium on which a document is printed by a printer, stores the information in a document management database in association with the document, and records the printing and updating of the document. The information is stored in a record having a relationship with the corresponding record in the document management database. When the document is updated, the revision history number in the history management database is incremented by 1, and the updated document is registered in a new record. A technique for presenting update information to a user based on identification information sometimes read is disclosed.

  In Patent Document 3, document ID, annotation position, and annotation assignment time are registered in a database, and when there is a search instruction using annotation as a search key, a document including an annotation that matches the search condition is referred to the addition time. It is disclosed that the information is displayed in chronological order or the annotation portion of the document is cut out and rearranged in time order.

  Further, in Patent Document 4, when access authority to an annotation is set for each user, access control to the annotation is performed based on the information when user authentication is performed, and when the annotation is edited and saved. Discloses a technique for automatically writing edit history information to an annotation in an annotation information file managed by a center apparatus and displaying the history as a list by a simple operation.

Japanese Patent Laid-Open No. 10-307936 JP 2003-67363 A JP 2004-199407 A JP 2002-245034 A

  It is an object of the present invention to obtain a file display device and a file display program that allow a reference to easily grasp updates made in the past on a file.

  In order to achieve the above object, the file display device according to the invention described in claim 1 corresponds to the file to be displayed and the contents of the update performed in the past with the date and time when the update was performed. Stored in the first storage means, a first storage means for storing the added update information, a specification means for specifying an arbitrary date and time within a past period including a period in which the file has been updated, and the first storage means An image generation unit that generates an image representing the contents of the file at a date and time designated via the designation unit, and a virtual three-dimensional display of the image generated by the image generation unit Display control means for displaying on the display means a screen arranged at a position corresponding to the designated date and time along a preset time axis in the space.

  According to a second aspect of the present invention, in the first aspect of the present invention, the image generation unit may store the contents of the file at a plurality of different dates and times in the past based on information stored in the first storage unit. Each of the images is restored, and a plurality of images representing the contents of the restored file are generated and stored in the second storage means, and the display control means displays the images representing the contents of the file at the designated date and time. The image is selected from the plurality of images stored in the second storage unit, and the selected image is displayed on the display unit.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the image generating means generates an image representing the content of the file at a specific date and time among a plurality of different dates and times in the past. Based on the update information stored in the first storage unit, out of the contents of the file at the specific date and time, from the content of the file at the date and time before the specific date and time among the multiple dates and times An update location is determined, and an image specifying the determined update location is generated as the image.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein one of a plurality of different dates and times in the past is based on the update information stored in the first storage means. Determining a corresponding location in the content of the file at a specific date and time when a later date and the content of the file at a date and time one after the specific date and time of the plurality of dates and times, Corresponding location determination means for performing all the dates and times when the next date and time exists among the plurality of dates and times, and the image generation means at a specific date and time when the date and time after one of the plurality of dates and times exist. As an image representing the content of the file, the position of the corresponding location determined by the corresponding location determination means in the content of the file at the specific date and time is the special date of the plurality of dates and times. When the layout of the content of the file at the specific date / time is changed so as to match the position of the corresponding location determined by the corresponding location determination means among the content of the file at the date / time one after the date / time An image representing the contents of the file after the layout change is generated.

  The file display device according to the invention described in claim 5 stores a file to be displayed and update information in which the contents of the update performed in the past are associated with the date and time when the update was performed. First storage means, designation means for designating an arbitrary display target period within a past period including a period in which the file has been updated, and information stored in the first storage means An image generating means for generating an image representing the contents of the file and clearly indicating an update performed within a display target period specified via the specifying means; and an image generated by the image generating means. Display control means for displaying on the display means.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, on the basis of the update information stored in the first storage means, a specification that includes a date and time that is the next of a plurality of different dates and times in the past. One of the plurality of dates and times is determined to determine a corresponding portion between the content of the file at the date and time and the content of the file at a date and time one after the specific date and time among the plurality of dates and times. Corresponding location determination means for performing all the dates and times when there is a later date and time is further provided, wherein the image generation means represents the contents of the file at the last date and time within the designated display target period, and the correspondence Based on the determination result of the corresponding location by the location determination means, the update performed within the specified display target period is changed to the content of the file at the end date and time within the specified display target period. It takes to generate an explicit image to the corresponding location.

  According to a seventh aspect of the present invention, in the fifth aspect of the invention, the display control unit displays the image generated by the image generation unit along a preset time axis in a virtual three-dimensional display space. A screen arranged at a position corresponding to the designated display target period is displayed on the display means.

  The invention according to claim 8 is the invention according to claim 1 or 6, wherein the display control means displays, as the screen, a plurality of images each representing the contents of the file at a plurality of past different dates and times. A bird's-eye view symbol having an outer shape whose outer surface is an envelope surface of the outer edge of each of the plurality of images when arranged at positions corresponding to the date and time along the time axis, and generated by the image generation unit A screen in which an image is arranged at a position corresponding to the designated date and time or display target period along the time axis in the bird's-eye view symbol is generated and displayed on the display means.

  According to a ninth aspect of the present invention, in the first or sixth aspect of the invention, based on the update information stored in the first storage unit, the specific date and time among a plurality of different dates and times in the past. In the contents of the file, there is a date and time before one of the plurality of dates and times to calculate the update amount from the content of the file at a date and time before the specific date and time among the plurality of times and dates. Update amount calculating means for each of the dates and times is further provided, wherein the display control means arranges the update amounts calculated for the plurality of dates and times by the update amount calculating means in order along the time axis. To display.

  The invention according to claim 10 is the invention according to claim 1 or claim 6, wherein an image representing the content of the file is displayed on the display means, and the arbitrary content in the content of the file represented by the image is displayed. An instruction means capable of selecting a part and instructing to display the transition of the arrangement of the selected part, and an arbitrary in the contents of the file represented by the image displayed on the display means via the instruction means And when the display of the transition of the arrangement of the selected portion is instructed, the file at a plurality of different dates and times in the past based on the update information stored in the first storage means An arrangement determining unit that determines an arrangement of the selected portion in the content of The arrangement display graphic representing each arrangement of said selected portion when to be displayed on the screen.

  The invention according to claim 11 is the invention according to any one of claims 1 to 10, wherein the image generated by the image generating means displays the content of the file as the content of the file. A schematic image image representing a general layout of the image, wherein the display control means displays the content of the same file as the schematic image image displayed on the display means in more detail than the schematic image image. Are displayed in a display area provided separately from the image in the screen.

  A file display program according to a twelfth aspect of the present invention stores a file to be displayed and update information in which the contents of the update performed in the past are associated with the date and time when the update was performed. A computer comprising first storage means and designation means for designating an arbitrary date and time within a past period including a period in which the file has been updated is stored in the first storage means. The image generation means for generating an image representing the contents of the file at the date and time designated via the designation means, and the virtual three-dimensional display of the image generated by the image generation means The display unit is caused to function as a display unit that displays a screen arranged at a position corresponding to the designated date and time along a preset time axis in the space.

  A file display program according to a thirteenth aspect of the present invention stores a file to be displayed and update information in which the contents of the update performed in the past are associated with the date and time when the update was performed. A computer comprising: a first storage unit; and a designation unit for designating an arbitrary date and time within a past period including a period in which the file has been updated. It makes it function as each means of any one of Claims 8-11.

  The file display program according to the fourteenth aspect of the present invention stores a file to be displayed and update information in which the contents of the update performed in the past are associated with the date and time when the update was performed. A computer comprising: first storage means; and designation means for designating an arbitrary display target period within a past period including a period in which the file has been updated. Image generation means for generating an image representing the contents of the file based on the stored information and clearly indicating an update performed within a display target period designated via the designation means; and the image generation The image generated by the means is caused to function as a display control means for displaying on the display means.

  A file display program according to a fifteenth aspect of the present invention stores a file to be displayed and update information in which the contents of the update performed in the past are associated with the date and time when the update was performed. A computer comprising: a first storage unit; and a designation unit for designating an arbitrary display target period within a past period including a period in which the file has been updated. 11 to function as each means described in any one of 11 above.

  The inventions according to claims 1, 5, and 12 to 15 make it possible for the reference person to easily grasp the update performed in the past on the file, as compared with the case where the present configuration is not provided. Has the effect.

  The invention according to claim 2 has an effect that the time required for switching the display when the designated date and time is changed can be shortened as compared with the case where this configuration is not provided.

  The invention according to claim 3 has an effect that it becomes easier for the referer to grasp the update location of the file as compared with the case where this configuration is not provided.

  The invention according to claim 4 has an effect that it is possible to make the reference person easily grasp the corresponding part in the contents of the different date and time of the file to be displayed as compared with the case where this configuration is not provided.

  The invention according to claim 6 has an effect that it is possible for the reference person to accurately grasp the location of the file that has been updated in the past, as compared with the case where this configuration is not provided.

  The invention according to claim 8 has an effect that it is possible to make the reference person visually grasp the designated date and time or the display target period, as compared with the case where this configuration is not provided.

  The invention according to claim 9 has an effect that it is possible to make the referencer know the transition of the update amount in the update performed on the file in the past as compared with the case where this configuration is not provided.

  According to the tenth aspect of the present invention, there is an effect that it is possible for the reference person to grasp the transition of the arrangement of an arbitrary part of the file as compared with the case where the present configuration is not provided.

It is a block diagram which shows schematic structure of the computer system which concerns on this embodiment. (A) is a flowchart showing the contents of the document updating process, and (B) is a flowchart showing the contents of the document saving process. It is a flowchart which shows the content of a document display process. It is a conceptual diagram for demonstrating the production | generation of a slice document and its schematic image. It is an image figure which shows an example of a display screen. It is a flowchart which shows the content of a display switching process. In the display target document, (A) is a display of the transition of the arrangement of the specific item, and (B) is an image diagram showing an example of the display of the transition of the content of the specific portion. It is an image figure which shows the other example of a display of the transition of the arrangement | positioning of a specific item in a display object document. It is an image figure which shows the other example of the symbol for bird's-eye views. It is an image figure for demonstrating the aspect which displays the general | schematic image which specified all the update locations performed within the designated display object period.

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. In the following, a mode in which a document is applied as data according to the present invention will be described. FIG. 1 shows a computer system 10 according to the present embodiment. The computer system 10 includes a server computer 12 connected to a large number of client terminals 16 via an intranet 14 (or the Internet).

  Each client terminal 16 is a terminal operated by different users, and is composed of, for example, a personal computer (PC) or the like, and includes a memory 16B including a CPU 16A, a RAM, an HDD (Hard Disk Drive), a flash memory, or the like. A nonvolatile storage unit 16C and a network interface (I / F) unit 16D are provided. Each client terminal 16 is connected to a display 18 as display means, a keyboard 20 and mouse 22 as input means, and is connected to the intranet 14 via a network I / F unit 16D. A document creation and editing application program for creating and editing a document and a document display program as a file display program according to claims 12 and 13 are installed in the storage unit 16C of the client terminal 16, respectively. The client terminal 16 functions as a file display device according to the present invention (more specifically, a file display device according to claims 1 to 4 and claims 8 to 11) by the CPU 16 </ b> A executing the document display program. .

  On the other hand, the server computer 12 includes a CPU 12A, a memory 12B including a RAM, a storage unit 12C including an HDD, and a network I / F unit 12D, and is connected to the intranet 14 via the network I / F unit 12D. ing. In the storage unit 12C, a document DB for registering data of a document created or updated by the user via the document creation / editing application while the document creation / editing application is running on the client terminal 16 (Database) is stored, and corresponds to the first storage means according to the present invention. Of the documents whose data is registered in the document DB, the update operation is performed by a plurality of users who have access authority for the document to which access authority is given to users other than the creator of the document. In addition to document data, a document update information file (described later) representing the update history of individual documents registered in the document DB is also registered in the document DB.

  Next, the operation of this embodiment will be described. To create a new document or update an existing document whose data has already been registered in the document DB, the user activates a document creation / editing application on the client terminal 16, and if a new document is created, a template document or the like is created. If an existing document is updated, an existing document whose data has been downloaded from the server computer 12 is opened by a document creation / editing application, and then characters (strings) and various objects (for example, various files such as images) are added to the opened document. This is done by repeating update operations such as adding (inserting), deleting, and moving annotations. An annotation including text is generally used as the annotation, but the annotation in the present embodiment includes various kinds of additional information such as an image, sound, and a link to an arbitrary web page. Here, the document creation / editing application according to the present embodiment performs the document update processing shown in FIG. 2A every time the update operation is performed.

  Note that this document update processing includes, for example, a single update operation such as addition (insertion), deletion, movement, etc. (for example, an update operation related to characters, operation in units of one character or one phrase, object, annotation, etc. If it is an update operation related to annotation, it is preferable to perform it every time a single object or a single annotation is performed), but a plurality of update operations may be performed as a unit, It is also possible to perform it every time the data accumulated with the update operation reaches a certain amount.

  In the document update process shown in FIG. 2A, first, in step 30, an update operation is performed by the user via the keyboard 20 or mouse 22 on a document that has been created or edited via the document creation / editing application. Is performed, information representing the contents of the current update operation stored in the memory 16B is acquired from the memory 16B. The information indicating the contents of the update operation includes the operation type (for example, addition (insertion) / deletion / movement), the update target type (for example, character / object / annotation), the update target position in the document, and the update target character. Column etc. are mentioned. In the next step 32, the information representing the contents of the current update operation acquired in step 30 is associated with the current date and time as the update date and stored in a predetermined area of the memory 16B as the document update information, and the document update process is terminated. To do.

  Further, the document creation / editing application according to the present embodiment performs the document storage processing shown in FIG. 2B when the user instructs to store the document that has been updated by the user in the document DB. Do. In this document saving process, first, in step 36, the data of the document instructed to be saved after the update operation is performed is uploaded to the server computer 12 via the intranet 14. Thus, in the server computer 12, if the document instructed to be saved is a newly created document, the uploaded document data is additionally registered in the document DB, and the document instructed to save is already existing. If the document has been updated, the uploaded document data is registered by overwriting the corresponding existing document data already registered in the document DB.

  In step 38, all document update information stored in a predetermined area of the memory 16B is uploaded to the server computer 12 via the intranet 14 together with the document save date (current date), and the document save process is terminated. To do. As a result, in the server computer 12, if the document instructed to be stored is a newly created document, the document update information uploaded and the storage date / time of the document are documents in which data has been additionally registered in the document DB first. If the document instructed to be saved is a document for which an update operation has been performed on an existing document, the data is first overwritten and registered in the document DB. Since the document update information file corresponding to the document has already been registered in the document DB, the uploaded document update information is added to the end of the existing document update information file and additionally recorded in the document DB.

  As described above, in this embodiment, each time a document is created or edited via the document creation / editing application, each time an instruction to save the document is given, each individual document created or edited is edited. The contents of the update operation are registered and stored in the document DB as document update information (file).

  Next, document display processing performed by the document display program will be described. When it is desired to grasp an update history or the like of a specific document registered in the document DB, the user selects a display target document via the keyboard 20 or the mouse 22, and changes the selected display target document. An operation to input an instruction to display (update history) so as to be grasped is performed. As a result, the document display program shown in FIG. 3 is performed on the client terminal 16 by the CPU 16A of the client terminal 16 executing the document display program.

  In this document display process, first, in step 50, data of a document selected by the user as a display target and a document update information file corresponding to the document are acquired from the server computer 12 via the intranet. The data of the display target document acquired here represents the current content (latest content) of the display target document. In the next step 52, the current display is based on the data of the display target document acquired in step 50. A schematic image representing the general content (for example, layout) of the target document is generated, and data of the generated schematic image is stored in the memory 16B or the like.

  As an example, as shown below the “current document” in FIG. 4 as an example, the items in the document, the content display area for each item, annotations added to the document, etc. are clearly indicated. Images can be applied. When clearly displaying the content display area for each item in the schematic image, the content display area for each item may be a fixed size, but the size may be changed according to the amount of text for each item in the display target document. preferable. Also, an object such as an image pasted on a display target document may be clearly indicated in the same manner as an annotation such as an annotation.

  In the next step 54, the length of the update period of the display target document is calculated by referring to the document update information file acquired in step 50. As this update period, for example, an elapsed period from the start of creation of the display target document can be applied. In the present embodiment, the transition (update history) of the display target document is displayed using the bird's-eye view symbol 150 and the time slider 152 as shown in FIG. Here, the bird's-eye view symbol 150 has a height direction as a time axis direction, and a plurality of schematic images representing outline contents of display target documents at a plurality of dates and times within an update period are displayed on the time axis. The overhead symbol according to claim 8, wherein the outer shape is a rectangular parallelepiped shape with the envelope surface of the outer edge of the plurality of schematic images as an outer surface when arranged at positions corresponding to individual dates and times along the line. It corresponds. When the height position of the bird's-eye view symbol 150 is designated by sliding the time slider 152, a rough image representing the outline of the display target document at the date and time corresponding to the designated height position is displayed. It is displayed at 150 specified height positions, but the date and time corresponding to the specified height position changes linearly within the update period according to the position change amount of the specified height position. Is calculated as

  For this reason, when the elapsed period from the start of the creation of the display target document is applied as the update period, for example, the display target document is updated at the specified height position within the elapsed period. While the position corresponding to the period is being moved, the schematic image of the display target document displayed on the overhead view symbol 150 changes, while the designated height position is the position of the display target document in the above elapsed period. While the position corresponding to the period in which the update is not performed is moved, the schematic image of the display target document displayed on the overhead view symbol 150 does not change.

  Further, as the update period, for example, a period in which the display target document is actually updated may be applied. For the period during which the display target document is actually updated, for example, the update date and time is extracted from the document update information included in the document update information file acquired in step 50, and the document save date and time is set from the document update information file. After extracting all these dates and sorting them in ascending order of date and time, all the update dates and times before the i-th save date and after the i-1th save date and time are extracted, Judging the period of the i-th storage date from the earliest date and time as the actual update period for the document to be displayed is performed in order for all the extracted storage dates and times, and all the determined periods are integrated You can ask for it. When the period in which the update is actually performed is applied as the update period, the display displayed on the overhead view symbol 150 as the specified height position moves regardless of the specified height position The outline image of the target document changes continuously.

  Further, in this embodiment, the division position (date and time) of each period when the update period calculated in step 54 is divided into a finite number of periods is referred to as a slice, and a rough image for each slice (corresponding date and time). When the height position of the bird's-eye view symbol 150 is changed by sliding the time slider 152, the outline position of the display target document displayed on the bird's-eye view symbol 150 is changed. By switching to the outline image of the slice corresponding to, the transition (update history) of the display target document is displayed. For this reason, in the next step 56, the total number of slices nmax and the slice time interval are determined based on the length of the update period calculated in step 54. Note that the total number nmax of slices can be determined to increase as the length of the update period increases, and the quotient obtained by dividing the update period by the total number nmax of slices can be set as the time interval of the slices. Alternatively, the total number nmax of slices may be constant, and only the slice time interval may be calculated according to the above.

  In the next step 58, the update date / time is extracted from the document update information included in the document update information file acquired in the previous step 50, and the extracted update date / time is sorted in the ascending order of the date / time. By extracting all the update dates and times before the date and time of the (i + 1) th slice after the date and time, and associating the document update information corresponding to the extracted update date and time with the i-th slice in order for all the slices All the document update information included in the document update information file is associated with any slice based on the update date and time. In step 60, a value obtained by subtracting 1 from the total number nmax of slices is assigned to the variable n.

  In the next step 62, the nth slice in ascending order of the date and time (since initially n = nmax−1, the corresponding date and time is the closest slice to the current date and time) is selected as the processing target. In step 64, it is determined whether or not the document update information is associated with the slice selected as the processing target. If the display target document has been updated within the period from the date / time of the nth slice to the date / time of the (n + 1) th slice (this date / time is the current date / time if n = nmax−1), step 64 is executed. If the determination is affirmative and the process proceeds to step 66, the nth slice is obtained for the data of the display target document (the current display target document if n = nmax-1) in the n + 1th slice (succeeding slice). The data of the display target document at the date and time of the nth slice is generated by performing an update opposite to the update represented by the document update information associated with, and the generated data is stored in the storage unit 16C or the memory 16B.

  As an example, the date and time of the slice to be processed is the date and time t3 in FIG. 4, the date and time of the (n + 1) -th slice is the current date and time, and the “deletion of old item C” shown in FIG. ”“ Change from old item D to new item C ”“ Add new item D ”and“ Add annotation (annotation) to new item D ”are associated with the slice to be processed Based on the updated document update information (document update information indicating these updates), reverse update to the data of the current display target document, that is, “deletion of annotation (annotation) added to new item D” “addition” Deleted new item D ”,“ Change (move) new item C to item D ”, and“ Restore deleted old item C ”are performed. As a result, document data such as “document at date and time t3 (slice document)” in FIG. 4 is generated as the data of the display target document at the date and time of the nth slice.

  In step 68, based on the document update information associated with the slice to be processed, the display target document (hereinafter referred to as “nth slice document”) of the date and time of the slice to be processed (nth slice); The corresponding location in the display target document of the date and time of the (n + 1) th slice (hereinafter referred to as “n + 1th slice document”) is recognized, and the recognition result of the corresponding location is stored in the memory 16B as the corresponding location information. Step 68 corresponds to step 82 described later and corresponding point determination means described in claim 4.

  For example, in FIG. 4, in the example where the date and time of the nth slice is t3 and the date and time of the (n + 1) th slice is the current date and time, “deletion of old item C” and “old item D” are performed during the period from date and time t3 to the current date and time. Since the update of “change (move)” to “new item C”, “add new item D”, and “add annotation (annotation) to new item D” has been performed, item A in the nth slice document is The annotation (annotation) added to the item A in the n + 1th slice document in the item A in the n + 1th slice document is the nth slice document in the annotation (annotation) added to the item A in the n + 1th slice document. Item B in item n + 1 is the item B in the slice document, item D in the nth slice document is item C in the n + 1 slice document, and item n in the nth slice document. The annotation (annotation) added to the item D in each corresponds to the annotation (annotation) added to the item C in the n + 1th slice document, while the item C in the nth slice document corresponds to the n + 1th slice. It can be determined that there is no corresponding part in the document.

  In the next step 70, the recognition result of the corresponding portion is reflected as a schematic image of the nth slice document based on the data of the slice document to be processed generated in step 66 and the recognition result of the corresponding portion in step 68. A schematic image is generated, and data of the generated schematic image is stored in the memory 16B (second storage means according to claim 2). In the present embodiment, the schematic images of individual slice documents have the same size, and the schematic image reflecting the recognition result of the corresponding location has a corresponding location in the n + 1th slice document of the nth slice document. The location is arranged so that the arrangement position of the nth slice document on the schematic image matches the arrangement position of the corresponding location on the outline image of the (n + 1) th slice document as much as possible, and the nth Of the slice documents, the location where the corresponding location does not exist in the (n + 1) -th slice document and the blank portion that is generated by matching the arrangement position of the corresponding location on the schematic image are clearly indicated. Is generated by changing the display to

  Specifically, for example, in FIG. 4, in the example in which the date and time of the nth slice is t3 and the date and time of the n + 1th slice is the current date and time, the items A, B, and D in the nth slice document are the n + 1th item. Since it corresponds to the items A, B, and C in the slice document, the arrangement positions of the items A, B, and D in the schematic image of the nth slice document are the items A, B, and C in the schematic image of the n + 1th slice document. An attempt is made to place items A, B, and D on the schematic image of the nth slice document so as to coincide with the arrangement position of. However, in this example, there is an item C for which there is no corresponding location in the (n + 1) th slice document between item B and item D of the nth slice document. Are arranged after the item C on the schematic image and are arranged at positions different from the corresponding item C in the schematic image of the (n + 1) th slice document. In addition, for item C in the nth slice document, since there is no corresponding location in the (n + 1) th slice document, there is no corresponding location in the (n + 1) th slice document on the schematic image of the nth slice document. It is clearly indicated as a location (in FIG. 4, this indication is indicated by hatching).

  For example, in FIG. 4, in the example where the date and time of the nth slice is t1, and the date and time of the (n + 1) th slice is t2, “addition of text to item A” and “new item” in the period from date and time t1 to date and time t2. "Add B", "Change (move) old item B to item C" and "Add annotation (annotation) to item A" are updated, and items A and B in the nth slice document are Since it corresponds to the items A and C in the n + 1th slice document, the arrangement position of the items A and B in the outline image of the nth slice document is the arrangement position of the items A and C in the outline image of the n + 1th slice document. An attempt is made to place items A and B on the schematic image of the nth slice document to match. Then, blank areas (between items A and B and after item B) generated by arranging items A and B on the schematic image of the nth slice document as described above are as follows. It is clearly indicated as a blank portion (in FIG. 4, this indication is indicated by hatching in the direction opposite to the portion where the corresponding portion does not exist).

  In the next step 72, based on the document update information associated with the slice to be processed (nth slice), the update represented by the document update information (from the date / time of the nth slice to the date / time of the (n + 1) th slice). The update performed during the period) is clearly shown on the (n + 1) th slice document (current display target document if n = nmax-1) and its outline image, and the (n + 1) th slice stored in the memory 16B. Change the slice document and its outline image. Note that the update of the slice document and its outline image is clearly indicated by, for example, changing the display color of an object such as a character or image corresponding to the update location, an annotation such as an annotation (an item including them if it is an outline image), This can be realized by changing the font if it is a character, or by emphasizing the display by adding a frame or shadow if it is an object or annotation. In addition, regarding deletion of various updates represented by the document update information, since the object to be specified does not exist in the (n + 1) th slice document, a mark (for example, in FIG. The update can be clearly indicated by adding a mark 166) attached to the outline image to the (n + 1) th slice document or the outline image. Note that the above-described steps 66, 70, 72 correspond to the image generation means according to claims 1 to 4, 11 together with steps 76, 78 described later.

  In the next step 74, the change amount from the nth slice document to the n + 1th slice document is calculated based on the document update information associated with the slice to be processed (nth slice), and the calculation result Is stored in the memory 16B and the process proceeds to step 84. In addition, this step 74 corresponds to the update amount calculating means according to claim 9 together with step 80 described later.

  On the other hand, if the display target document has not been updated within the period from the date / time of the nth slice to the date / time of the (n + 1) th slice, the determination in step 64 is negative and the process proceeds to step 76. The data of the −1st slice document is also stored in the memory 16B as the data of the nth slice document. In step 78, the data of the outline image of the (n + 1) th slice document is also stored in the memory 16B as the outline image of the nth slice document. In step 80, the change amount = 0 is stored in the memory 16B as the change amount from the nth slice document to the n + 1th slice document, and in the next step 82, the same portion of the n + 1th and nth slice documents is stored. The corresponding location information to be associated is stored in the memory 16B, and the process proceeds to step 84.

  In step 84, it is determined whether or not the variable n has reached 1. If the determination is negative, the process proceeds to step 86, the variable n is decremented by 1, and the process returns to step 62. As a result, Step 62 to Step 86 are repeated until the determination in Step 84 is affirmed, and the above-described slice document (data) generation / storage and outline image (data) generation are performed for each slice as a processing target. Each process of storage, calculation storage of document change amount, and storage of corresponding part information is performed.

  If the determination in step 84 is affirmed, the process proceeds to step 88. As shown in FIG. 5, for example, a document display screen including an overhead view symbol 150 and a content display window 154 is generated, and the generated document display screen is displayed. It is displayed on the display 18 of the client terminal 16. In the present embodiment, the current contents of the display target document are initially displayed on the document display screen. Therefore, in step 88, as shown in FIG. And a time slider 152 is positioned at the upper end of the moving range, and a document display screen in which the current contents of the display target document is displayed in the contents display window 154 is generated and displayed on the display 18. Let As shown in FIG. 5, the document display screen includes a slider 156 for instructing scrolling of the display target document displayed in the content display window 154, and the contents of the outline image displayed on the overhead view symbol 150. A frame 158 clearly indicating the range displayed in the display window 154 and a change amount indicator 160 each indicating the change amount between individual slice documents are also displayed. The above-described step 88 corresponds to the display control means described in claims 1, 2, 8 to 11 together with a display switching process described later.

  In the next step 90, display switching processing for switching the display in the document display screen in accordance with an instruction from the user is performed. This display switching process will be described with reference to FIG. In the display switching process, it is first determined in step 100 whether or not any instruction has been input from the user, and step 100 is repeated until the determination is affirmed. When any instruction is input by operating the keyboard 20 or mouse 22 by the user, the determination in step 100 is affirmed and the process proceeds to step 102, and the instruction input by the user displays the document display screen. It is determined whether it is an instruction to end.

  If this determination is negative, the process proceeds to step 104, and an operation for inputting an instruction by the user selects an arbitrary item of the outline image of the display target document displayed on the overhead view symbol 150. Later, it is determined whether or not the operation is to move the position of the time slider 152. If the determination in step 104 is also negative, the process proceeds to step 106, and an operation for inputting an instruction by the user selects an arbitrary portion of the schematic image of the display target document displayed on the overhead view symbol 150. Then, it is determined whether or not the operation is to move the position of the time slider 152. When this determination is also negative, the routine proceeds to step 108, where it is determined whether or not the operation for inputting an instruction by the user is an operation for moving the position of the time slider 152.

  When it is desired to scroll the range displayed in the content display window 154 in the display target document, the user performs an operation of moving the position of the slider 156 via the mouse 22. When this operation is performed, the determination in step 108 is denied and the process proceeds to step 110, and the range displayed in the content display window 154 in the display target document is moved to the slider 156 after being moved by the user. Scroll processing that changes according to the position is performed. Further, in this scroll processing, the position of the frame 158 is also moved in accordance with the change of the range displayed in the content display window 154 (the size of the frame 158 is also changed if necessary). When step 110 is performed, the process returns to step 100.

  When it is desired to check the update history of the display target document (how the display target document has been updated in the past), the user performs an operation of moving the position of the time slider 152 via the mouse 22. . Thus, the time slider 152 corresponds to the designation means described in claim 1 and the like together with the mouse 22 operated when the position of the time slider 152 is changed. Note that the change amount indicator 160 displayed in the document display screen is provided for the purpose of assisting the user in determining the position of the movement destination of the time slider 152 in the above operation. Of the updates, for example, when it is desired to confirm the contents of the display target document when an update with a particularly large change amount is performed, the time slider 152 is moved to a position where the change amount indicated by the change amount indicator 160 is particularly large. By performing the operation to be performed, the user can easily instruct to display the contents of the display target document when an update with a particularly large change amount is performed.

  When an operation for moving the position of the time slider 152 is performed, the determination in step 108 is affirmed and the process proceeds to step 114, and the position corresponding to the position is determined based on the position of the time slider 152 after being moved by the user. The date and time within the update period of the display target document is determined, and the slice document with the date and time closest to the determined date and time is determined. In the next step 116, the schematic image of the display target document displayed on the overhead view symbol 150 is deleted, and the slice document determined in step 114 is selected from the schematic images of each slice document stored in the memory 16B. Data of the schematic image is read from the memory 16B and displayed on the overhead symbol 150 at a height position corresponding to the position after the movement of the time slider 152. In step 118, among the slice documents stored in the memory 16B, the data of the slice document determined in step 114 is read from the memory 16B, and a part of the contents (for example, the head part) is read in the contents display window 154. Display. When step 118 is performed, the process returns to step 100.

  By the above processing, as shown in FIG. 5B as an example, the schematic image of the display target document displayed on the bird's eye symbol 150 is displayed on the display target document at the date and time corresponding to the position after the time slider 152 is moved. While switching to a schematic image representing a layout or the like, the display position of the schematic image is also moved to a position corresponding to the position after the movement of the time slider 152, and the display in the content display window 154 is also changed after the movement of the time slider 152. The display is switched to the display representing the contents of the display target document at the date and time according to the position. Since the processing from step 114 to step 118 is repeated each time the time slider 152 is moved, the user appropriately moves the time slider 152 and also displays a schematic image or content display window 154 that switches according to the movement of the time slider 152. By referring to the display, it is possible to grasp the update history of the display target document (how the display target document has been updated in the past).

  In the present embodiment, it is also possible to display how the arrangement of a specific item in the display target document has changed with the update of the display target document during an arbitrary period within the update period of the display target document. In the case where the above display is desired, the user can display an overview image of the date and time corresponding to the beginning or end of the display target period in the update period displayed on the overhead view symbol 150. After selecting a display target item on the displayed schematic image, an operation for specifying the display target period is performed by moving the time slider 152 to a position corresponding to the end or the top of the display target period.

  When the above operation is performed by the user, the determination in step 104 is affirmed and the process proceeds to step 120, and the movement is performed based on the movement range (movement start position and movement end position) in the movement of the time slider 152 by the user. By determining the date and time range (display target period) of the display target document corresponding to the range, and reading out from the memory 16B all slice documents within the determined display target period among the slice documents stored in the memory 16B. Extract. In step 122, the range corresponding to the item selected on the schematic image by the user is determined for each slice document based on the corresponding location information corresponding to each slice document extracted in step 120. In step 124, the schematic image of the display target document displayed on the bird's-eye view symbol 150 is erased, and the figure (individual figure) clearly indicating the correspondence between the ranges determined in step 122 for individual slice documents within the display target period. In the slice document) is additionally displayed on the overhead view symbol 150.

  Thereby, for example, for the display target document shown in FIGS. 4 and 5, when the period from the date t1 to the present time is specified as the display target period and the item A is specified as the display target, as an example, FIG. A graphic 162A as shown in A) is displayed. Further, for the same display target document, when the item B is specified as the display target for the same period as the display target period, a figure 162B as shown in FIG. 7B is displayed as an example. Become. By referring to this figure, the user can grasp how the arrangement of the item specified as the display target has changed with the update of the display target document within the specified display target period. .

  In the next step 126, the contents display window 154 displays the contents of the slice document corresponding to the position of the time slider 152 after the movement by the user is completed (the slice document having the date and time closest to the date and time corresponding to the position of the time slider 152). And return to step 100. In the above processing, the unit for displaying the transition of the arrangement is not limited to the “item” in the display target document. For example, an object such as an image or an annotation such as an annotation in the display target document may be displayed. It is also possible to display the transition.

  In the present embodiment, it is also possible to display how the content of a specific part in the display target document has changed with the update of the display target document during an arbitrary period within the update period of the display target document. In the case where the above-mentioned display is desired, the user displays a schematic image of the date and time corresponding to the start or end of the display target period in the update period in the state where the overhead view symbol 150 is displayed. After selecting a display target portion on the displayed schematic image, an operation for designating the display target period is performed by moving the time slider 152 to a position corresponding to the end or the top of the display target period.

  When the above operation is performed by the user, the determination in step 106 is affirmed and the process proceeds to step 128, and the movement is performed based on the movement range (movement start position and movement end position) in the movement of the time slider 152 by the user. By determining the date and time range (display target period) of the display target document corresponding to the range, and reading out from the memory 16B all slice documents within the determined display target period among the slice documents stored in the memory 16B. Extract. In step 130, the range corresponding to the location selected on the schematic image by the user is determined for each slice document based on the corresponding location information corresponding to each slice document extracted in step 128, and the determination is made. Extract the contents of each slice document within the range. In step 132, the schematic image of the display target document displayed on the bird's eye symbol 150 is erased, and a graphic clearly showing the contents extracted in step 130 for each slice document within the display target period is displayed as the bird's eye symbol. 150 is additionally displayed.

  Thus, for example, for the display target document shown in FIGS. 4 and 5, the period from the date and time t1 to the present is specified as the display target period, and the range indicated by the circle in FIG. 7B is specified as the display target portion. In this case, as shown in FIG. 7B, as an example, a figure 164 is displayed which is cylindrical and clearly shows the contents within the designated circular range in each slice document. By referring to this figure, the user can grasp how the contents of the location specified as the display target have changed with the update of the display target document within the specified display target period. .

  In the next step 134, the user selects a slice document corresponding to the position of the time slider 152 after the movement by the user (slice document having the date and time closest to the date and time corresponding to the position of the time slider 152) by the user. The contents of the part including the designated part are displayed in the contents display window 154, and the process returns to step 100. In addition, the external shape of the display target portion selected by the user in the above process is not limited to a circular shape, and other shapes such as a rectangular shape may be applied.

  When the user who has grasped the update history of the display target document through the above-described display switching process is instructed to end the display of the document display screen, the determination in step 102 is affirmed and the display switching process is ended, and the document display program The document display process ends.

  In the above, when the display of the transition of the arrangement of the specific item in the display target document within the designated display target period is instructed, the correspondence of the arrangement of the specific item in each slice document within the display target period As a figure for clearly indicating the attachment, a figure (for example, the figure 162A shown in FIG. 7A or the figure 162B shown in FIG. 7B) having an outer shape of the envelope surface of the above-mentioned range in each slice document is looked down. As described above, for example, as shown in FIG. 8, by explicitly indicating the correspondence of the arrangement of specific items in each slice document within the display target period by a graphic such as an arrow, You may make it display the transition of arrangement | positioning of a specific item.

  In the above description, the schematic images of the individual slice documents have the same size, and the schematic image of the nth slice document in which the corresponding location exists in the (n + 1) th slice document (next slice document) is the nth Although the embodiment has been described in which the arrangement position of the part on the schematic image of the slice document matches the corresponding part on the schematic image of the (n + 1) th slice document as much as possible, the present invention is based on this. It is not limited, and the outline image of each slice document is sized according to the size of each slice document, and the process of matching the position on the outline image of the corresponding portion in each slice document is omitted. Also good. In general, a document increases in size as it is updated. Therefore, in the above example, if the outline shape of the overhead view symbol is the shape with the outer envelope surface of the outline image of each slice document as the external surface symbol, As shown in FIG. 9 as an example, the cross-sectional area (schematic image size) increases as the height position increases. Thus, the bird's-eye view symbol described in claim 8 is not limited to a rectangular parallelepiped shape.

  Further, in the above description, the change amount between individual slice documents (change in update amount within the update period) is displayed by the change amount indicator 160 (see FIG. 5). However, the present invention is not limited to this. It is also possible to display the transition of the update amount by another display method such as changing the density at each height position on the side surface of the overhead image according to the transition of the update amount.

  Further, in the above description, when the date and time is specified by operating the time slider 152, the aspect in which the schematic image of the slice document having the date and time closest to the specified date and time is displayed on the overhead view symbol 150 has been described. Is not limited to this. As an example, as shown in FIG. 10, a head slider 166A for designating the date and time corresponding to the head of the display target period and a tail slider 166B for designating the date and time corresponding to the end of the display target period are provided. When the display target period is specified by operating the head slider 166A and the end slider 166B, as shown in FIG. 10B as an example, the outline contents of the display target document within the specified display target period ( For example, the outline of the display target document at the end date and time within the specified display target period), and a summary image that clearly shows all the update points made during the specified display target period. An image may be displayed on the display 18.

  For example, the outline image is generated by extracting all the outline images of the slice document corresponding to the designated display target period, and updating the update points specified in the extracted individual outline images within the display target period. This can be realized by displaying all the corresponding portions on the schematic image representing the outline of the display target document at the end date and time. The schematic image used for the above processing is preferably a schematic image representing the outline contents of the slice document after the arrangement (layout) is changed so that the positions of the corresponding portions in each slice document match. By simply projecting (transparent display) the update location specified in each outline image onto the outline image representing the outline of the display target document at the end date and time within the display target period, the above processing is performed. A schematic image can be generated.

  The above aspect corresponds to the invention described in claims 5 and 7, and the document display program in the above aspect corresponds to the file display program described in claims 14 and 15. Further, as is apparent from the above-described aspect, the present invention is not limited to displaying a screen in which a schematic image of a display target document is arranged in a virtual three-dimensional space, as shown in FIG. It is also within the scope of the present invention to display a schematic image of a display target document in a plane. Furthermore, you may make it display the general | schematic image which specified all the update locations performed within the display object period designated as mentioned above on the symbol 150 for bird's-eye view demonstrated previously. This aspect corresponds to the invention described in claim 6.

  In the above description, the document update information is stored, and the update of the reverse of the update represented by the document update information is performed to generate the display target document data corresponding to each slice. The present invention is not limited to this, and document data may be stored every time the document is updated. In this case, it is necessary to increase the capacity of the storage means for storing the document data (in the above embodiment, the storage unit 12C of the server computer 12), but there is no need to generate the display target document data corresponding to each slice. Thus, it is possible to generate a schematic image of the display target document corresponding to each slice in a short time.

  In the above description, the aspect in which the general image representing the general content (layout or the like) of the display target document is displayed on the overhead view symbol 150 has been described. However, the present invention is not limited to this, and the content display window is described above. The contents (for example, characters) of the display target document displayed in 154 may also be displayed on the overhead view symbol 150.

  Furthermore, although the aspect in which the data and the schematic image of the display target document are generated in advance and stored in the memory 16B or the like has been described, the present invention is not limited to this. After the designation, data of the display target document corresponding to the designated date and time may be generated, and a schematic image may be generated from the generated data of the display target document and displayed on the overhead view symbol 150.

  In the above description, the document data and the document update information are stored in the storage unit 12C of the server computer 12 connected to the client terminal 16 via the intranet 14. However, the present invention is not limited to this. However, the document data and the document update information file may be stored in the storage unit 16C of the client terminal 16 (storage means directly connected to the computer functioning as the file display device according to the present invention). Good.

  In the above description, the document is described as an example of the data according to the present invention. However, the data according to the present invention is not limited to this, and examples of the data according to the present invention include a program source code, a moving image, and CAD. It is possible to apply drawings and the like created using the above.

  Further, in the above description, the file display program according to the present invention is stored (installed) in advance in the storage unit 16C of the client terminal 16, but the file display program according to the present invention may be a CD-ROM or DVD-ROM. It is also possible to provide it in a form recorded on a recording medium such as

DESCRIPTION OF SYMBOLS 10 Computer system 12 Server computer 12C Storage part 14 Intranet 16 Client terminal 18 Display 20 Keyboard 22 Mouse 150 Overhead symbol 152 Time slider 154 Contents display window 160 Change amount indicator 166A Lead slider 166B Trailing slider

Claims (15)

A first storage unit that stores update information in which a file to be displayed and the content of an update performed on the file in the past are associated with the date and time when the update was performed;
A designation means for designating an arbitrary date and time within a past period including a period in which the file is updated;
Image generating means for generating an image representing the contents of the file at the date and time designated via the designation means based on the information stored in the first storage means;
Display control means for displaying on the display means a screen in which the image generated by the image generating means is arranged at a position corresponding to the designated date and time along a preset time axis in a virtual three-dimensional display space. When,
File display device including The image generation means restores the contents of the file at a plurality of different dates and times in the past based on the information stored in the first storage means, and creates a plurality of images representing the contents of the restored file. Generated and stored in the second storage means,
The display control means selects an image representing the contents of the file at the designated date and time from the plurality of images stored in the second storage means, and causes the display means to display the selected image. The file display device according to claim 1.   The image generation means generates an image representing the content of the file at a specific date and time among a plurality of different dates and times in the past, based on the update information stored in the first storage means and at the specific date and time. Of the contents of the file, an update location from the content of the file at a date and time immediately before the specific date and time among the plurality of dates and times is determined, and an image clearly indicating the determined update location is used as the image. The file display device according to claim 1, which is generated. Based on the update information stored in the first storage means, the content of the file at a specific date and time that is a date and time that is the next date out of a plurality of different date and time in the past, and the one of the plurality of dates and times Corresponding location determination means for determining a corresponding location in the file content at a date and time one after a specific date and time for all the dates and times that have a date and time after the one among the plurality of dates and times In addition,
The image generation means is determined by the corresponding location determination means among the contents of the file at the specific date and time as an image representing the content of the file at a specific date and time when the next date and time is present among the plurality of dates and times. In addition, the position of the corresponding location matches the position of the corresponding location determined by the corresponding location determination means in the contents of the file at the date and time one after the specific date and time among the plurality of dates and times. The file display device according to claim 1, wherein an image representing the content of the file after the layout change when the layout of the content of the file at the specific date and time is changed is generated. A first storage unit that stores update information in which a file to be displayed and the content of an update performed on the file in the past are associated with the date and time when the update was performed;
A designation means for designating an arbitrary display target period within a past period including a period in which the file is updated;
Image generating means for generating an image representing the contents of the file and clearly indicating an update performed within a display target period specified via the specifying means based on information stored in the first storage means When,
Display control means for causing the display means to display the image generated by the image generation means;
File display device including Based on the update information stored in the first storage means, the content of the file at a specific date and time that is a date and time that is the next date out of a plurality of different date and time in the past, and the one of the plurality of dates and times Corresponding location determination means for determining a corresponding location in the file content at a date and time one after a specific date and time for all the dates and times that have a date and time after the one of the plurality of dates and times In addition,
The image generation means represents the contents of the file at the last date and time within the specified display target period, and based on the determination result of the corresponding location by the corresponding location determination means, the specified display target The file display device according to claim 5, wherein an image in which an update performed within a period is clearly indicated at a corresponding position in the content of the file at the last date and time within the designated display target period is generated.   The display control means includes a screen in which the image generated by the image generation means is arranged at a position corresponding to the designated display target period along a preset time axis in a virtual three-dimensional display space. 6. The file display device according to claim 5, wherein the file is displayed on the display means.   The display control means includes the plurality of images when the plurality of images each representing the contents of the file at a plurality of past different dates and times are arranged at positions corresponding to the dates and times along the time axis as the screen. An overhead view symbol having an outer shape with an envelope surface of the outer edge of the image of the image of the image as the outer surface, and the image generated by the image generation means is specified along the time axis in the overhead view symbol The file display device according to claim 1, wherein a screen arranged at a position corresponding to a date and time or a display target period is generated and displayed on the display unit. Based on the update information stored in the first storage unit, in the content of the file at a specific date and time among a plurality of different dates and times in the past, one of the plurality of dates and times one before the specific date and time Update amount calculating means for calculating an update amount from the contents of the file at a date and time, respectively for a date and time when a previous date and time exists among the plurality of date and time,
7. The display control unit according to claim 1, wherein the display control unit displays the update amounts respectively calculated for the plurality of dates and times by the update amount calculation unit in order along the time axis and displayed in the screen. File display device. Instructing to select an arbitrary part of the contents of the file represented by the image and display the transition of the arrangement of the selected part in a state where the image representing the contents of the file is displayed on the display means. Possible instruction means;
When an arbitrary part in the content of the file represented by the image displayed on the display means is selected via the instruction means, and the display of the transition of the arrangement of the selected part is instructed, the first An arrangement determining means for determining the arrangement of the selected portion in the contents of the file at a plurality of past different dates and times based on the update information stored in the storage means;
Further comprising
The said display control means displays the arrangement | positioning display figure which each represents arrangement | positioning of the said selected part in the said some date on the said screen based on the determination result by the said arrangement | positioning determination means. File display device. The image generated by the image generation means is a schematic image image representing a schematic layout in a state where the content of the file is displayed as the content of the file,
The display control unit is provided with a detailed display image that represents the content of the same file as the schematic image displayed on the display unit in more detail than the schematic image, separately from the image. The file display device according to claim 1, wherein the file display device displays the image in a display area. A first storage unit that stores update information in which a file to be displayed and the contents of the update performed on the file in the past are associated with the date and time when the update is performed; and the file is updated A computer comprising: designation means for designating any date and time within a past period including a period of
Image generating means for generating an image representing the contents of the file at the date and time designated via the designation means based on the information stored in the first storage means;
And a display for displaying on the display means a screen in which the image generated by the image generating means is arranged at a position corresponding to the designated date and time along a preset time axis in a virtual three-dimensional display space. A file display program for functioning as a control means.   A first storage unit that stores update information in which a file to be displayed and the contents of the update performed on the file in the past are associated with the date and time when the update is performed; and the file is updated A computer comprising: designation means for designating an arbitrary date and time within a past period including a performed period. 12. The computer according to any one of claims 1 to 4 and claim 8 to 11. File display program to function as each means. A first storage unit that stores update information in which a file to be displayed and the contents of the update performed on the file in the past are associated with the date and time when the update is performed; and the file is updated A designation means for designating an arbitrary display target period within a past period including a performed period, and a computer comprising:
Image generating means for generating an image representing the contents of the file and clearly indicating an update performed within a display target period specified via the specifying means based on information stored in the first storage means ,
And a file display program for functioning as display control means for causing the display means to display the image generated by the image generation means.   A first storage unit that stores update information in which a file to be displayed and the contents of the update performed on the file in the past are associated with the date and time when the update is performed; and the file is updated A computer comprising: designation means for designating an arbitrary display target period within a past period including a performed period is caused to function as each means according to any one of claims 5 to 11. File display program for.

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