JP2004185095A - Information retrieval system, information retrieval method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize an information retrieval system capable of efficiently executing a retrieval considering the access right to a database. <P>SOLUTION: A retrieval part 14 forms a document candidate list showing the similarity order of document information matched to a retrieval request in reference to a retrieval index stored in an index information storage part 12. The retrieval part 14 executes the processing of determining whether the documents of the document candidate list are browsable by the user 19 of a client terminal 18 or not successively from the top document thereof by use of an access control information confirmation part 17. When a prescribed number of documents browsable by the user 19 are arranged, the retrieval part 14 stores the value of the next retrieval pointer corresponding to the position of the document finally determined browsable. When the next retrieval result list is requested, the retrieval part 14 executes the accessibility determination processing by the access control information confirmation part 17 successively from the document next the document finally determined browsable. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an information search system, an information search method, and a program for searching a document information group stored in a database in response to a search request from a client terminal.
[0002]
[Prior art]
2. Description of the Related Art In recent years, there has been an increasing need for cross-searching various types of information stored in a plurality of databases distributed on a computer network.
[0003]
In this case, it is important how to search a plurality of databases at high speed. For this reason, recently, a search index is prepared as index information in the search server separately from a database for storing actual data, and a list of document information matching the search request is stored using the index information. From now on, an approach of presenting a search result list to a requesting user has become common.
[0004]
By using index information, a search result list can be immediately presented to a user without making an inquiry to an individual database via a network.
[0005]
In addition, as a technique for quickly searching a database distributed in each region, for example, a distributed database access system for quickly referencing data from a distributed multidimensional database group is also known. (For example, see Patent Document 1).
[0006]
[Patent Document 1]
JP-A-2002-108899 (page 4-6, FIG. 1)
[0007]
[Problems to be solved by the invention]
By the way, recently, in order to improve security, access right control in which an access right is set for each database and a user who can view the database or document information is restricted has been introduced.
[0008]
In this case, in the conventional search system that presents the search result list to the requesting user, the search result list is created without any consideration of the access right control information of each database. However, there is a problem that document information or the like that cannot be actually browsed is presented to the user as a search result.
[0009]
The solution to this is
1) The search index has access control information
2) Inquire whether each database can be accessed
There is a method that can be considered.
[0010]
Among them, the method 1) requires a huge amount of information for managing the search index, and every time the information on the access right in the database is changed, it is necessary to update all data including the search index. In some cases, resulting in poor management efficiency.
[0011]
The method 2) has a problem that the time required to create a search result list increases due to the inquiry about whether or not the database can be accessed. In particular, for example, a search result list indicating “the first 10 search results that match the search request” is first presented to the user, and when the next search result list is requested by the user, “the next 10 search results that match the search request” is displayed. In a system that presents the search result list to the user, there is a danger that the time required for searching for “the next ten items that match the search request” will increase significantly.
[0012]
That is, in such a system, a search result list to be presented to the user is usually created from a document candidate list in which documents matching the search request are arranged in order of similarity. In this case, it is usually sufficient to manage only the number of documents in the document candidate list up to the number of documents presented to the user, and this should be presented as “the next 10 documents that match the search request”. It is possible to determine the order of the document in the document candidate list that the first document is.
[0013]
However, considering the access right to the database, the list of document candidates includes documents that cannot be presented to the user as search result candidates, so the tenth document first presented to the user is However, the document is not always the tenth document in the document candidate list.
[0014]
Therefore, even when creating a search result list corresponding to “the next ten items that match the search request”, it is necessary to sequentially confirm the access right from the first document in the document candidate list. This is a process of selecting 20 documents that can be browsed by the user from the top of the document candidate list, and extracting documents from the 11th to the 20th of the 20 documents. It is necessary.
[0015]
As described above, when performing a search in consideration of the access right to the database, there is a problem that the search speed is significantly reduced in the conventional method.
[0016]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an information search system, an information search method, and a program that can efficiently execute a search in consideration of a database access right. I do.
[0017]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention provides an information search system for searching a document information group stored in a database in response to a search request from a client terminal, wherein index information for searching each of the document information groups is provided. Means for holding a client terminal, means for authenticating the user of the client terminal, means for referring to the index information, and means for creating a document candidate list indicating the order of similarity of document information matching the search request, To determine whether or not the document information to be determined is document information that can be viewed by the user, based on the access right control information corresponding to each piece of document information stored in the database and the authentication result of the user. First access permission / non-permission judgment means for sequentially executing the access permission / non-permission judgment processing from the first document information included in the document candidate list; When the number of pieces of document information determined to be viewable by the user by the determination process reaches a predetermined number, a list of the document information determined to be viewable document information is first searched for. Means for providing to the client terminal as a list, means for storing a search pointer corresponding to a position on the document candidate list for the document information determined to be the last viewable document information, Is requested based on the stored search pointer, the next document of the document information determined to be the last viewable document information included in the document candidate list. A second access permission / inhibition determining means for sequentially executing the access permission / inhibition determination processing from information.
[0018]
In this information search system, in order to perform a search in consideration of an access right, an access permission / inhibition determination process for determining whether or not document information to be determined is document information that can be browsed by a user is performed. A determination means is provided. When the first search result candidate list is presented, access permission / inhibition determination processing is performed until the number of pieces of document information determined to be document information that can be browsed by the user reaches a predetermined number. It is executed sequentially from the document information. As a result, only the document information determined to be viewable document information can be presented to the user as a search result list. Further, a search pointer corresponding to the position on the document candidate list for the document information determined to be the last viewable document information is stored, and when the display of the next search result list is requested, the search pointer is stored. The access permission / inhibition determination processing is sequentially executed from the document information next to the document information determined to be the last viewable document information included in the document candidate list based on the search pointer that has been set. Thus, the value corresponding to the position on the document candidate list of the document information determined to be the last viewable document information is not the value indicating the number of document information items presented to the user. Is used as a search pointer, it is possible to omit the access permission / inhibition determination processing for documents for which access permission / inhibition has already been determined, and efficiently execute a search in consideration of the database access right. can do.
[0019]
The first and second access permission / non-permission determining means may be configured such that the database manages an access right for the entire database and an access right for each document information stored in the database. Means for determining which of the managed databases, and if the database is a database that manages access rights for each of the document information, the user is required for each document information included in the document candidate list. Means for inquiring of the database as to whether or not browsing is possible, and in the case where the database is a database for managing access rights to the entire database, inquiring of the database as to whether or not the user can browse the database. By doing so, each individual included in the document candidate list Is constituted by means omitted process for inquiring whether the user for each document information which is viewable in the database.
[0020]
As a result, it is possible to perform the access permission / inhibition determination process suitable for the attribute related to the access right control of the database, and it is possible to reduce the time required for the access permission / inhibition determination process. In particular, in a system for cross-searching a plurality of databases, it is possible to perform access permission / inhibition processing that matches the attributes of each database. Can be done.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows the configuration of an information search system 11 according to one embodiment of the present invention. The information search system 11 is a search device for cross-searching document information groups stored in a plurality of databases distributed on a computer network such as the Internet / intranet. The information search system 11 is composed of a computer connected to a computer network, and is used as a search server computer that provides an information search service to a client terminal 18 on the computer network.
[0022]
Here, it is assumed that information stored in a plurality of different types of database servers 21 to 23 that are distributed and exist on a computer network is searched. Each of these database servers 21 to 23 is composed of, for example, a file server, a relational database (RDB) server, an electronic filing server, and the like. The database servers 21 to 23 store and manage various types of document information as databases 31 to 33, respectively. In a file server or an electronic filing server, document information is managed in a directory structure, and such a management structure is also referred to as a database in this example.
[0023]
Each of the database servers 21 to 23 can manage the access right control information for each database held by the database server. The access right control information is information for restricting users who can view the data in database units or in document information units held in the database. The database to which the access right is set holds access right control information corresponding to the database.
[0024]
The client terminal 18 is composed of, for example, a normal personal computer, and transmits a search request to the information search system 11 via a web browser or the like in response to an operation by the user 19.
[0025]
The information search system 11 searches for document information groups stored in the databases 31 to 33 of the database servers 21 to 23 in response to a search request transmitted from the client terminal 18 via the computer network. As shown, the information search system 11 includes an index information storage unit 12, an index information management unit 13, a search unit 14, a user authentication unit 15, a user information storage unit 16, and an access control information confirmation unit 17. .
[0026]
The index information storage unit 12 stores index information (search index) for quickly searching the document information groups stored in the search target databases 31 to 33, respectively. That is, the index information storage unit 12 is provided with index storage units 121 to 123 as shown in the figure, and these index storage units 121 to 123 store search indexes corresponding to the databases 31 to 33, respectively. ing. The search index is created from each piece of document information, and indicates information such as word elements necessary for full-text search / natural language search obtained by morphological analysis or the like for each document information. The search index also includes a URL indicating the location of a database in which each piece of document information is stored, a text sentence of each piece of document information, and the like.
[0027]
Further, in the index information storage unit 12, database attribute information storage units 131 to 133 are provided corresponding to the index storage units 121 to 123, respectively. These database attribute information storage units 131 to 133 store attribute information relating to access right control information of each of the corresponding databases. This attribute information is used to determine which database manages what access right.
[0028]
The index information management unit 13 manages the search index stored in the index information storage unit 12. The search unit 14 executes a process of searching for a document information candidate that matches the search request by referring to the search index stored in the index information storage unit 12 through the index information management unit 13. This search process is executed in consideration of the access right, and only document information that can be browsed by the user 19 of the client terminal 18 that has transmitted the search request is presented to the user 19 as a search result candidate.
[0029]
The search unit 14 is provided with a next search pointer storage unit 141 for storing a next search pointer. The next search pointer is a pointer used for efficiently executing a search in consideration of the access right. When the same user requests the next candidate of the search result list with the same search formula, the last search pointer that has already been confirmed whether or not access is possible. This is used to start checking whether access is possible from the next document after the first document. Details of this next search pointer will be described with reference to FIG.
[0030]
The user authentication unit 15 refers to the user information 16 indicating a user name, a password, and the like of each of the logon users registered in the information search system 11 in advance, and transmits a search request to the information search system 11 for each client terminal. Authenticate the user. This authentication process is executed, for example, when the client terminal 19 logs on to the information search system 11.
[0031]
The access control information confirmation unit 17 allows the user 19 to view the document information to be determined based on the access right control information corresponding to each document information stored in the databases 31 to 33 and the authentication result by the user authentication unit 15. Access permission / inhibition determination processing for determining whether or not the document information is appropriate. Since the access right control information is held in the database, in the access permission / inhibition determination processing, an inquiry is made as to whether or not access to the corresponding database is possible.
[0032]
Next, an outline of a search process executed by the information search system 11 will be described with reference to FIG.
[0033]
The information retrieval system 11, the client terminal 18, and the database servers 21 to 23 are connected to a computer network 100, respectively. First, the client terminal 18 logs in to the information search system 11, and a search request is transmitted from the client terminal 18 to the information search system 11. The information search system 11 refers to the search index and creates a document candidate list indicating the order of similarity (score) of document information that matches the condition specified in the search request.
[0034]
The document candidate list is obtained by using a search index corresponding to each of the databases 31 to 33, individually selecting a predetermined number of similar documents for each database, and sorting a set of the selected document groups in order of score. . Then, in order from the sorted document sequence, that is, the first document in the document candidate list, the database server that stores the document is inquired whether the user 19 of the client terminal 18 can view the document. Based on this inquiry, a determination is made as to whether access is possible.
[0035]
When the candidate documents are presented to the client terminal 18 as a search result list in units of ten, the determination as to whether or not access is possible by the inquiry is sequentially performed until the number of documents that can be browsed by the user 19 becomes ten. When the number of documents that can be browsed by the user 19 reaches ten, a search result list showing a list of those documents is provided from the information search system 11 to the client terminal 18. At this time, the information search system 11 stores a next search pointer indicating the order of the document determined to be the last viewable document on the document candidate list.
[0036]
If the user 19 requests the display of the next ten items, the information search system 11 can finally browse the ten items based on the next search pointer to generate a search result list of the next ten items. The access permission / inhibition is sequentially determined by the inquiry in order from the document following the document determined to be present.
[0037]
FIG. 3 shows an example of a search screen provided from the information search system 11 to the client terminal 18. As shown, the search screen defines a question text input field 201 and a keyword input field 202 for inputting a question text and a keyword, respectively, and a “search” button 203 for transmitting a search request. . Further, a “next list” button 204 for requesting display of the next search result list is provided on the search screen. In the case of a system that displays ten documents at a time, when a “next list” button 204 is pressed, a search result list showing a list of eleventh to twentieth documents that can be viewed by the user 19 of the client terminal 18 Is displayed on the search screen as shown.
[0038]
The search result list indicates the title of each document that meets the conditions specified in the search request, a part of the text in the document, and the like. In the title, link information to a database in which the document actually exists is embedded. When the user clicks on the title, a request to obtain the document is transmitted from the client terminal 18 to the database server that manages the database that stores the document. Thus, the user can browse the actual document information.
[0039]
Next, the next search pointer will be described with reference to FIG.
[0040]
As shown in FIG. 4, the initial value of the next search pointer is “1”, and when displaying the first ten items, sequentially from the top of the sorted document sequence (document candidate list) A determination is made as to whether access is possible. Here, it is assumed that the user has no access right to the second, sixth, and ninth documents from the top.
[0041]
In this case, when it is determined that the thirteenth document from the top can be browsed, ten documents are prepared. The value of the stored next search pointer is the position (= 13) +1 of the document that has been determined to be last browsable. When the next ten documents are requested, the access right is determined in order from the fourteenth document indicated by the next search pointer. For example, when it is determined that the user does not have access right to the 16th and 22nd documents and that the 25th document can be browsed, the 10 If all the documents are available, the value of the next search pointer stored at this time is the position (= 25) +1 of the document that was determined to be the last viewable.
[0042]
Thus, the value corresponding to the position on the document candidate list of the document information determined to be the last viewable document information is not the value indicating the number of document information items presented to the user. Is used as a next search pointer, it is possible to omit the determination of access permission for a document for which access determination has already been performed, and to efficiently perform a search in consideration of database access rights. It is possible to execute.
[0043]
Next, a search process executed by the information search system 11 will be described with reference to FIGS.
[0044]
FIG. 5 schematically shows a data generation process by the information search system 11, and FIG. 6 shows a procedure of a search process. In the following, it is assumed that a search result list is presented to the client terminal 18 in 20 units.
[0045]
The search unit 141 of the information search system 11 searches the search indexes stored in the index storage units 121 to 123 using a search formula corresponding to the search request transmitted from the client terminal 18, thereby obtaining the client terminal 18. Then, a document that meets the conditions specified in the search request transmitted from is selected (step S101). In this case, for each database, for example, the top 200 documents that match the search request are selected. For a database in which there are not 200 documents with a certain score or higher, only documents with a certain score or higher are selected.
[0046]
Next, the search unit 141 creates a document candidate list by merging 200 documents individually searched for each database and sorting the merged documents in the order of score (step S102). The search unit 141 acquires the next search pointer from the next search pointer storage unit 141 (step S103), and uses the access control information confirmation unit 17 to access the documents in the document candidate list specified by the next search pointer in order. A determination is made as to whether or not it is possible (step S104). Since the initial value of the next search pointer is 1, the access control information confirmation unit 17 executes an inquiry for access permission determination in order from the first document.
[0047]
As a result of the access permission determination, for a document determined to be viewable by the user 19, the search unit 141 secures the document as a document to be returned to the user (step S105). The search unit 141 updates the value of the next search pointer by +1 each time the access permission / inhibition determination of one document is completed (step S106).
[0048]
Thereafter, the search unit 141 determines whether the number of documents secured as documents to be returned has reached 20 (step S107). If not (NO in step S107), the search unit 141 returns to the process in step S104, and uses the access control information confirmation unit 17 to search for a document in the document candidate list specified by the value of the next search pointer. Then, the access permission / inhibition is determined. In this manner, until the number of documents secured as documents to be returned reaches 20, the value of the next search pointer is updated, and the determination of whether access to the document specified by the value of the next search pointer is successively made. Be executed.
[0049]
If the number of documents secured as documents to be returned has reached 20 (YES in step S107), the search unit 141 stores the current value of the next search pointer in the next search pointer storage unit 141 (step S108). ). The value of the current next search pointer indicates the position +1 on the document candidate list for the document information determined to be the last viewable document information.
[0050]
Then, the search unit 141 returns a list of documents secured as documents to be returned, that is, a list of documents determined to be viewable by the user 19, to the client terminal 18 as a search result list (step S109). In this way, only documents that can be browsed by the user 19 of the client terminal 18 are provided to the client terminal 18 as a search result list.
[0051]
Thereafter, if the display of the next search result list is requested by the user 19 (YES in step S110), the search unit 141 is stored in each of the index storage units 121 to 123 using the same search formula as the previous time. The search index is searched, and the 200 documents individually searched for each database are merged and sorted in the order of score, thereby creating a document candidate list (steps S101 and S102). Next, the search unit 141 obtains the next search pointer from the next search pointer storage unit 141 (step S103), and uses the access control information confirmation unit 17 to search for the corresponding search candidate in the document candidate list specified by the next search pointer. It is determined in order from the document to be accessed whether or not access is possible (step S104). Since the value of the next search pointer indicates the position +1 on the document candidate list for the document information determined to be the last viewable document information in the previous first 20 search result displays, It is possible to omit the access permission / inhibition determination process for each document group for which the access permission / inhibition determination has been performed. Thereafter, the processing of the above-described steps S105 to S109 is performed, so that a list of search results for the next 20 cases is provided to the client terminal 18.
[0052]
If the next search pointer is not used as described above, the access permission / inhibition determination is sequentially performed again from the first document in the document candidate list, so that the user 19 can browse from the 21st to the 40th. It is necessary to perform a process for selecting a document. On the other hand, in the present embodiment, by using the next search pointer, access permission / inhibition determination is sequentially performed from the document next to the last document determined to be viewable in the search result display for the previous 20 cases. By selecting only 20 documents that can be browsed by the user 19, it is possible to provide the user 19 with 21 to 40 documents that can be browsed by the user 19.
[0053]
As shown by a dotted line in FIG. 6, it is also possible to omit the processing of steps S101 and S102 and use the list of document candidates created by the previous search as it is. Also, instead of storing the next search pointer in the next search pointer storage unit 141 in step S108, the value of the next search pointer is returned to the client terminal 18, and the value of the next search pointer is sent to the client terminal 18 together with the next search request. It is also possible to adopt a configuration for receiving from the server.
[0054]
Next, the procedure of the access permission / inhibition confirmation process executed by the access control information confirmation unit 17 in step S104 in FIG. 6 will be described with reference to the flowchart in FIG.
[0055]
The access control information confirming unit 17 determines whether or not the user 19 can browse in units of individual documents included in the document candidate list as an operation mode for determining whether each document can be accessed. Inquiry mode, (2) Mode for omitting inquiries in individual document information units by inquiring the corresponding database whether the user 19 can browse in database units instead of individual document units, (3) Access right There is a mode for omitting all inquiries for databases for which is not set.
[0056]
These modes (1) to (3) are selectively used based on attribute information relating to access right control of a database in which document information to be determined is stored. The attribute information of each of the databases 31 to 33 is held in the database attribute information storage units 131 to 133.
[0057]
The access control information confirmation unit 17 first obtains attribute information corresponding to the database holding the document to be determined in the document candidate list (step S201), and based on the obtained attribute information, It is determined whether or not the database is a database for which access determination is necessary, that is, whether or not the access right is set (step S202).
[0058]
If the database does not require access determination, that is, a database in which no access right is set and all users can browse (NO in step S202), the access control information confirmation unit 17 performs access by inquiring the database. By omitting the confirmation of permission / inhibition, it is immediately determined that the document is a document that can be browsed by the user 19 (step S207).
[0059]
On the other hand, if the database needs to determine whether access is possible, that is, a database to which an access right is set (YES in step S202), the access control information confirmation unit 17 determines the database based on the attribute information acquired in step S201. Is a database that only needs to be checked for access to the entire database, that is, whether it is a database that manages only access rights to the entire database, or an access right for each document information stored in the database It is determined whether the database is a database that manages (step S203).
[0060]
If the access right is managed for each document information stored in the database (NO in step S203), the access control information confirmation unit 17 allows the user 19 authenticated by the user authentication unit 15 to browse. A query is made to the database holding the document to determine whether the document is a valid document, and it is determined whether access is possible (step S204). This inquiry is actually issued to the database server that manages the database.
[0061]
On the other hand, if the database only needs to confirm the access permission of the entire database, that is, a database that manages only the access right to the entire database (YES in step S203), the access control information confirmation unit 17 It is determined whether or not the database has already been checked whether or not the database is accessible to the user 19 (step S205).
[0062]
If the database is not a database whose access permission has not been confirmed (NO in step S205), the access control information confirmation unit 17 determines whether or not the database can be browsed by the user 19 authenticated by the user authentication unit 15 by checking the document. A process for inquiring the held database is executed to determine whether or not the document can be accessed (step S206). This inquiry is actually issued to the database server that manages the database. On the other hand, if the database has been confirmed to be accessible (YES in step S205), the access control information confirming unit 17 omits the inquiry to the database and, based on the previous determination result in step S206, determines whether the user has access. It is immediately determined whether the document 19 is a browsable document (step S207).
[0063]
In this manner, by performing the access permission / inhibition determination process suitable for the attribute of each database, it is possible to increase the efficiency of the access permission / inhibition determination process.
[0064]
As described above, according to the information search system 11 of the present embodiment, it is possible to efficiently search the contents of the plurality of databases 31 to 33 in a cross-sectional manner while considering the access control information of each data. .
[0065]
Note that all of the above-described processing executed by the information search system 11 can be realized by a computer program. Therefore, only by introducing the program to a computer on a network through a storage medium storing the computer program, the present embodiment can be implemented. The same effect as described above can be easily obtained.
[0066]
Further, the present invention is not limited to the above-described embodiment, and can be variously modified in an implementation stage without departing from the gist thereof. For example, the number of databases to be searched may be one, and the access control information may be held in the information search system 11 unless the access right of each database is updated. Further, in the present embodiment, the position +1 of the document determined to be finally viewable is stored as the next search pointer, but the position of the document determined to be viewable last is stored as the search pointer. In addition, when displaying the next search result, the access permission / prohibition may be confirmed from the document specified by the search pointer +1.
[0067]
Further, the embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some components are deleted from all the components shown in the embodiment, the problems described in the column of the problem to be solved by the invention can be solved, and the effects described in the column of the effect of the invention can be solved. Is obtained, a configuration from which this configuration requirement is deleted can be extracted as an invention.
[0068]
【The invention's effect】
As described above, according to the present invention, it is possible to efficiently execute a search in consideration of a database access right.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an example of a functional configuration of an information search system according to an embodiment of the present invention.
FIG. 2 is an exemplary block diagram for explaining an outline of a search process executed by the information search system of FIG. 1;
FIG. 3 is an exemplary view showing an example of a search screen provided to a client terminal by the information search system of FIG. 1;
FIG. 4 is a view for explaining a next search pointer managed by the information search system of FIG. 1;
FIG. 5 is a diagram schematically showing a data generation process in a search process performed by the information search system of FIG. 1;
FIG. 6 is an exemplary flowchart showing the procedure of a search process executed by the information search system of FIG. 1;
FIG. 7 is an exemplary flowchart showing the procedure of access permission / inhibition determination processing executed by the information search system of FIG. 1;
[Explanation of symbols]
11 Information retrieval system
12 ... Index information storage unit
13 Index information management unit
14 Search section
15: User authentication unit
18 ... Client terminal
21-23 ... Database server
31-33 ... Database
121 to 123: Index storage unit
131 to 133: Database attribute information storage unit
141 ... Next search pointer storage unit

Claims (8)

In an information search system for searching a document information group stored in a database in response to a search request from a client terminal,
Means for holding index information for searching each of the document information groups,
Means for authenticating the user of the client terminal;
Means for creating a document candidate list indicating the order of similarity of document information that matches the search request with reference to the index information;
To determine whether or not the document information to be determined is document information that can be viewed by the user, based on the access right control information corresponding to each piece of document information stored in the database and the authentication result of the user. First access permission / non-permission judgment means for sequentially executing the access permission / non-permission judgment processing from the first document information included in the document candidate list;
When the number of pieces of document information determined to be viewable by the user by the access permission determination process reaches a predetermined number, a list of the document information determined to be viewable document information is first displayed. Means for providing to the client terminal as a search result list of
Means for storing a search pointer corresponding to a position on the document candidate list for the document information determined to be the last viewable document information;
When the display of the next search result list is requested by the user, the document information determined to be the last viewable document information included in the document candidate list based on the stored search pointer And a second access permission determining means for sequentially executing the access permission determination processing from the next document information. The access right control information is held in the database,
The first and second access permission / non-permission determining means include:
Means for determining which of the database is a database managing access rights to the entire database, and a database managing access rights for each document information stored in the database;
When the database is a database that manages access rights for each of the document information, means for inquiring the database as to whether the user can browse for each document information included in the document candidate list,
If the database is a database that manages access rights to the entire database, by querying the database whether the user can view the database, individual document information included in the document candidate list 2. The information retrieval system according to claim 1, further comprising: means for omitting a process of inquiring the database whether or not the user can browse the information every time. An information search system for searching a document information group stored in a plurality of databases distributed on the computer network in response to a search request transmitted from a client terminal via a computer network,
Means for holding index information for searching a document information group stored in each of the plurality of databases,
Means for authenticating the user of the client terminal;
Means for creating a document candidate list indicating the order of similarity of document information that matches the search request with reference to the index information;
Based on the access right control information corresponding to each of the document information groups respectively stored in the plurality of databases and the authentication result of the user, whether or not the document information to be determined is the document information that can be browsed by the user Access permission / non-permission determination processing for sequentially determining the access permission / non-permission determination processing from the first document information included in the document candidate list, based on attribute information on access right control information of each of the plurality of databases. A first process for inquiring a corresponding database as to whether or not the user can view the document information for each discrimination target, and the user browsing the database for omitting an inquiry for each discrimination target document information. And a second process for inquiring of a corresponding database whether the process is possible. And vinegar permission determining means,
When the number of pieces of document information determined to be viewable by the user by the access permission determination process reaches a predetermined number, a list of the document information determined to be viewable document information is first displayed. Means for providing to the client terminal as a search result list of
Means for storing a search pointer corresponding to a position on the document candidate list for the document information determined to be the last viewable document information;
The access permission / inhibition determining process for selectively executing the first process and the second process based on the stored search pointer when the next search result list is requested by the user; And a second access permission determining means for sequentially executing the document information subsequent to the document information determined to be the last viewable document information included in the document candidate list. Information retrieval system. In an information search method for searching a document information group stored in a database in response to a search request from a client terminal,
Authenticating a user of the client terminal;
Creating a document candidate list indicating the order of similarity of document information that matches the search request, by referring to index information for searching each of the document information groups;
To determine whether or not the document information to be determined is document information that can be viewed by the user, based on the access right control information corresponding to each piece of document information stored in the database and the authentication result of the user. A first access permission determination step of sequentially executing the access permission / prohibition determination processing from the first document information included in the document candidate list;
When the number of pieces of document information determined to be viewable by the user by the access permission determination process reaches a predetermined number, a list of the document information determined to be viewable document information is first displayed. Providing to the client terminal as a search result list of
Storing a search pointer corresponding to a position on the document candidate list for the document information determined to be the last viewable document information;
When the user requests display of the next search result list, the last-viewable document information included in the document candidate list is the access permission / inhibition determination process based on the stored search pointer. A second access permission / inhibition determining step for sequentially executing the document information subsequent to the document information determined as above. The access right control information is held in the database,
The first and second access availability determination steps are:
Determining whether the database is a database managing access rights to the entire database, or a database managing access rights for each document information stored in the database;
When the database is a database that manages access rights for each of the document information, a step of inquiring the database as to whether or not the user can browse for each document information included in the document candidate list,
If the database is a database that manages access rights to the entire database, by querying the database whether the user can view the database, individual document information included in the document candidate list 5. The method according to claim 4, further comprising: omitting a process of inquiring the database as to whether or not the user can browse each time. An information search method for searching a document information group stored in a plurality of databases distributed on the computer network in response to a search request transmitted from a client terminal via a computer network,
Authenticating a user of the client terminal;
A step of creating a document candidate list indicating the order of similarity of the document information that matches the search request by referring to index information for searching the document information group stored in each of the plurality of databases;
Based on the access right control information corresponding to each of the document information groups respectively stored in the plurality of databases and the authentication result of the user, whether or not the document information to be determined is the document information that can be browsed by the user Is a first access permission determination step of sequentially executing the access permission determination processing of determining from the first document information included in the document candidate list, based on attribute information on access right control information of each of the plurality of databases. A first process of inquiring a corresponding database as to whether or not the user can view the document information for each discrimination target; and the user can browse the database to omit an inquiry for each document information to be discriminated. And a second process for inquiring of a corresponding database about whether the first And Seth permission determining step,
When the number of pieces of document information determined to be viewable by the user by the access permission determination process reaches a predetermined number, a list of the document information determined to be viewable document information is first displayed. Providing to the client terminal as a search result list of
Storing a search pointer corresponding to a position on the document candidate list for the document information determined to be the last viewable document information;
The access permission / inhibition determining process for selectively executing the first process and the second process based on the stored search pointer when the next search result list is requested by the user; A second access permission determination step of sequentially executing the following from the document information subsequent to the document information determined to be the last viewable document information included in the document candidate list. Information retrieval method. A program for causing a computer to execute a process of searching for a document information group stored in a database in response to a search request transmitted from a client terminal,
Authenticating a user of the client terminal;
A process of creating a document candidate list indicating the order of similarity of document information matching the search request by referring to index information held in the computer for searching each of the document information groups The steps to take,
To determine whether or not the document information to be determined is document information that can be viewed by the user, based on the access right control information corresponding to each piece of document information stored in the database and the authentication result of the user. Sequentially executing the access permission / inhibition determination process from the first document information included in the document candidate list;
When the number of pieces of document information determined to be viewable by the user by the access permission determination process reaches a predetermined number, a list of the document information determined to be viewable document information is first displayed. Providing to the client terminal as a search result list of
Storing a search pointer corresponding to a position on the document candidate list for the document information determined to be the last viewable document information;
When the user requests display of the next search result list, the last-viewable document information included in the document candidate list is the access permission / inhibition determination process based on the stored search pointer. And a procedure for sequentially executing the document information following the document information determined to be the same as the document information. A program for causing a computer to execute a process of searching document information groups stored in a plurality of databases distributed on the computer network in response to a search request transmitted from a client terminal via the computer network. hand,
Authenticating a user of the client terminal;
A step of creating a document candidate list indicating the order of similarity of the document information that matches the search request by referring to index information for searching the document information group stored in each of the plurality of databases;
Based on the access right control information corresponding to each of the document information groups respectively stored in the plurality of databases and the authentication result of the user, whether or not the document information to be determined is the document information that can be browsed by the user An access permission / non-permission judgment process for sequentially executing the access permission / non-permission judgment processing for judging an access right control information from the head document information included in the document candidate list. A first process of inquiring a corresponding database as to whether or not the user can view the document information for each document information; and determining whether or not the user can view the database in order to omit an inquiry for each document information to be determined. And a second process for inquiring of the corresponding database. And,
When the number of pieces of document information determined to be viewable by the user by the access permission determination process reaches a predetermined number, a list of the document information determined to be viewable document information is first displayed. Providing to the client terminal as a search result list of
Storing a search pointer corresponding to a position on the document candidate list for the document information determined to be the last viewable document information;
The access permission / inhibition determining process for selectively executing the first process and the second process based on the stored search pointer when the next search result list is requested by the user; Sequentially from the document information next to the document information determined to be the last viewable document information included in the document candidate list. And the program.

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