KR100743080B1 - Method and apparatus for sending/receiving a multimedia opt-in message - Google Patents

Abstract

Disclosed are a multimedia opt-in message transmitting / receiving apparatus and method for transmitting a multimedia opt-in message to a user terminal receiving a digital broadcast according to various methods. According to the present invention, an apparatus for transmitting a multimedia opt-in message includes: a message storage unit for storing a multimedia opt-in message to be transmitted to a user terminal agreeing to receive a message; A message controller which receives terminal state information from the user terminal and controls transmission of the message with reference to header information of the multimedia opt-in message; And a message transmitter for transmitting the multimedia opt-in message to the user terminal according to a predetermined communication method. As a result, a message can be transmitted for each group, or a registered message can be transmitted, and the form of the message can be in the form of a complex message combining text, an image, a video, or the like, or can be assigned various priorities.

Description

Device for transmitting and receiving multimedia opt-in message and method thereof {Method and apparatus for sending / receiving a multimedia opt-in message}

1 is a block diagram of a multimedia opt-in message transmission and reception system according to an embodiment of the present invention,

2 is a detailed block diagram of a multimedia opt-in message transmission and reception system of FIG.

3 is a flowchart of a process of transmitting an opt-in message for each reception group;

4 is a diagram illustrating a protocol for transmitting a registered message;

5 is a reference diagram for explaining a process in which a message transmission server transmits only a message template, and SO / DMC converts the message into a recipient-specific message and delivers the message to a user terminal.

6 illustrates an example of a screen for receiving a multimedia opt-in message;

7 illustrates a format of a multimedia opt-in message according to an embodiment of the present invention.

The present invention relates to a digital broadcasting technology, and more particularly, to an apparatus and method for transmitting and receiving a multimedia opt-in message to a user terminal receiving a digital broadcast according to various methods and receiving the same.

In general, in a digital TV (DTV) system, there is a return channel for bidirectional communication between a broadcasting station and a user terminal (eg, a set-top box) in addition to a broadcasting channel through which digital broadcasting content is transmitted. . In a data broadcast supporting two-way communication, a viewer may actively participate in a broadcast program to present his or her opinion, or may purchase a desired item by accessing a home shopping site associated with the broadcast while watching the broadcast. That is, in addition to simply transmitting and receiving video and audio, various additional information such as sports, drama related information, EPG (Electronic Program Guide), real time news, weather forecast, stock quote, etc. can be transmitted through a return channel. For example, through an application program that can interactively exchange data with a broadcaster, the viewer can actively participate in the broadcast.

In other words, various application services such as receiving receiver information of a user terminal through a return channel and transmitting a specific content or a message to the receiver are possible. Among these application services is a ticker service. The ticker service is similar to the closed caption broadcasting, in which a message to notify the receiver is transmitted to the user terminal through a return channel, and the contents are displayed in caption while watching the broadcast.

The difference between the ticker service and the conventional closed caption broadcasting is that a message to be transmitted from a broadcasting station to a user terminal is transmitted through a separate return channel, rather than being included in the broadcast content, which is received by the user terminal. It is displayed in the same form. However, such a service is not intended to transmit a specialized message according to the receiver information of the user terminal, that is, the characteristics of each terminal user, but is a service that transmits the same message to all users. . In addition, it is not possible to confirm whether the receiver has received the message, and the form of the message is also a simple text form.

On the other hand, the conventional message transmission is carried out in a manner of indiscriminately transmitting a message to a plurality of unspecified user terminal receiving the content. If the user does not want to receive such a message, he or she must register the complaint with the message transmission server. Then, the message is not sent to those who have been registered to reject the message, but is sent to others. This message transmission method is called an opt-out method. In such an opt-out method, not only inconveniences the content receiving subscribers, but also gives a sense of rejection, greatly reducing the advertising effect.

On the other hand, there is a method of transmitting a message only when the user explicitly consents to receiving it, and not transmitting the message to others. Such a message transmission method is called an opt-in method. In the opt-in method, the receiver has previously agreed to receive a message of a specific field of interest according to a predetermined procedure, so the advertisement effect is excellent and does not cause unnecessary communication traffic.

Accordingly, an aspect of the present invention is to provide a multimedia opt-in message transceiving apparatus and method for transmitting a multimedia opt-in message to a user terminal receiving a broadcast according to various methods and receiving the same.

Another technical problem to be solved by the present invention is a multimedia opt-in message transmitting and receiving device for transmitting a registered message requesting whether the recipient receives the multimedia opt-in message has read the message, or transmits the message only to a specific group of the user terminal And a method thereof.

In addition, the technical problem to be achieved by the present invention, when transmitting a multimedia message, or only the message template, other devices convert the message to reflect the receiver information of the user terminal, or give a point as a reward for receiving the message To display the message at the scheduled time by reserving the display time of the received message, to send a message having a higher priority by giving priority to a plurality of messages, or to send and receive a message transmitted in conjunction with the currently playing program. The present invention provides a multimedia opt-in message transmitting and receiving device and a method thereof.

According to the present invention, a message storage unit for storing a multimedia opt-in message to be transmitted to the user terminal agreed to receive the message; A message controller which receives terminal state information from the user terminal and controls transmission of the message with reference to header information of the multimedia opt-in message; And a message transmitter for transmitting the multimedia opt-in message to the user terminal according to a predetermined communication method.

The message controller may set a user terminal of a corresponding group as a destination of the multimedia opt-in message by referring to a group ID included in a header of the multimedia opt-in message.

In addition, the multimedia opt-in message may preferably include a registered transmission field indicating that the message is repeatedly transmitted at predetermined time intervals until an acknowledgment signal from the user terminal is received.

In addition, the technical problem is an AV data playback unit for receiving and playing back AV data; A message receiving unit receiving a multimedia opt-in message according to a predetermined communication method; A terminal status information transmitter for transmitting status information of the user terminal; And a display unit for displaying the reproduced AV data and the received multimedia opt-in message.

On the other hand, according to another field of the present invention, the technical problem (a) reading the message in the message storage unit for storing the multimedia opt-in message to be transmitted to the user terminal agreed to receive the message; (b) receiving terminal status information from a user terminal and controlling transmission of the message with reference to header information of the multimedia opt-in message; And (c) transmitting the multimedia opt-in message to the user terminal according to a predetermined communication method.

In addition, the technical problem (a) receiving a multimedia opt-in message according to a predetermined communication method; (b) transmitting status information of the user terminal; And (c) displaying the received multimedia opt-in message.

On the other hand, according to another field of the present invention, the technical problem in the information storage medium recording the data structure of the multimedia opt-in message, a group ID field for specifying to transmit the multimedia opt-in message to the user terminal of the group; A registered transmission field indicating that the message is repeatedly transmitted at predetermined time intervals until an acknowledgment signal from the user terminal is received; A reserved display field for specifying to display the message repeatedly at a set number of repetitions at a set time; A repetition number field for storing a repetition number for displaying the message at the reserved time; A display time interval field for storing a display time interval of the message; A priority field for specifying a transmission order when a plurality of messages are to be transmitted at the same time; And when transmitted in association with a program being played, is also achieved by an information storage medium comprising an identifier field of the program.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a multimedia opt-in message transmission and reception system according to an embodiment of the present invention.

Referring to FIG. 1, the multimedia opt-in message transmission / reception system includes a content transmission server 110, a plurality of user terminals 120, and a message transmission server 130. The message transfer server 130 has a database.

The content delivery server 110 transmits content encoded with digital data through a broadcast channel. The content delivery server 110 may be, for example, a head-end system of a digital TV station, a broadcasting system of a comprehensive cable broadcasting company (SO), or a broadcasting system of a digital multimedia center (DMC) company. The user terminal 120 receives the content transmitted from the content delivery server 110, decodes it, and displays the content on the screen. Meanwhile, in addition to the broadcast channel through which the content is transmitted, a return channel exists between the content delivery server 110 and the user terminal 120. The content delivery server 110 may communicate with the user terminal 120 in both directions through the return channel. TCP / IP is implemented on the return channel to transmit and receive various additional information in the form of packet data.

The user terminal 120 transmits the terminal identifier information to the content delivery server 110 through this return channel. The content delivery server 110 stores information such as a user terminal owner's name, address, telephone number, etc. in a database as subscriber information according to a terminal identifier. In addition, the status of the user terminal 120, the message acknowledgment data and the like is transmitted to the message transmission server 130. The message transmission server 130 stores information such as a terminal identifier, a group ID, a name of a user terminal owner, a job, an age, a gender, a hobby, and the like as information on a user who receives a message. The group ID is an ID for a group of interest to the user or a group preset by the user. For example, a user interested in golf joins a golf group and the message transfer server sends a golf-related message to the recipient of the group, referring to the group ID included in the message header. An example of the state information of the user terminal 120 may include whether the power of the user terminal 120 is on. When the power of the user terminal 120 is on, it may be determined that the notification message is in a reception possible state.

The message acknowledgment data is used to transmit a registration message described later. When the user terminal 120 receives the registered message transmitted by the message transmission server 130, the receiver notifies the fact of arrival of the message. Then, when the receiver reads the message, the receiver transmits a confirmation message that the message has been read to the message transmission server 130. The message transmission server 130 retransmits the message at regular time intervals until receiving the acknowledgment message of the receiver. This is because the registered message is a message that the user terminal 120 continuously retransmits by checking whether the receiver has read the message.

The identifier information of the program currently being executed is used to transmit a message linked to a program currently being reproduced in the user terminal. For example, if the content being broadcasted on the user terminal is a soccer game, it is used to selectively transmit an advertisement message about a sporting goods. Meanwhile, a message related to a program is transmitted to the user terminal in advance, and when the user views the program, it is preferable to read and display the stored message.

The message transmission server 130 receiving the receiver information of the user terminal searches for the database 140 to determine whether there is a message to be transmitted to the user terminal 120. The database 140 may be included in the message transmission server 130 or may exist separately. The message stored in the database 140 includes a registered transmission status, a terminal identifier, a group ID, a reservation display, a priority, a coordinated program identifier, and a message body content. To send). The detailed configuration of the message format will be described later with reference to FIG. 7. In addition, a management tool for managing a database is provided so that editing such as adding or deleting a message to be transmitted can be performed through a user interface for using the management tool.

The message transmission server 130 first determines whether the user terminal is in a reception state of the message and then transmits the message. For example, the message transmission server 130 transmits a pre-scheduled response request message, and when the response message is received from the user terminal 120 determines that the user terminal 120 is in a receivable state. As another example, without using the response request message, the user terminal 120 reports to the message transmission server 130 that it is in a state that can be received at a predetermined time interval, the message transmission server 130 reports the received status information Manages and determines whether the user terminal 120 is in a receivable state by checking the state information before transmitting the notification message.

The process of sending a message is summarized as follows. First, in case of message transmission to one user, user information including terminal identifier information is extracted from the user database 140 stored in the message transmission server 130, and the content is transmitted through the content transmission server 110 using the same. You can send a message to the terminal.

Meanwhile, in the case of group transmission, the group ID for group transmission is stored in the database of the message transmission server 130. The database of the message transmission server 130 maps a group ID, a description of the group, a user name belonging to the group, terminal identifier information, and the like to the terminal information. For example, in the case of creating a new group for Seocho-dong subscribers, a mapping relationship for the group is created from a database of the message transmission server 130 and a database of the content delivery server 110. The group information is updated periodically. In the case of broadcasting or multicasting during group transmission, the group ID included in the message received from the user terminal is compared with the group ID of the user to receive only a message that is sent to the user or the group ID is transmitted to the corresponding group ID by the content delivery server 110. The message may be transmitted by individually transmitting the identifier information of the belonging user terminal to the corresponding terminal through 1: 1 communication. Of course, when using broadcasting or multicasting, the user terminal must have a group ID to which it belongs.

2 is a detailed block diagram of the multimedia opt-in message transmission and reception system of FIG.

The message transmission server includes a message storage unit 212, a message control unit 214, a message transmission unit 216, and a user interface unit 218. The message storage unit 212 stores a message to be transmitted to the user terminal 120. And setting information including information necessary for displaying a message, for example, color, font, display position, display method, and the like. Such setting information may be stored in the user terminal. When the setting information is recorded in the message storage unit 212, the setting information is received from the message transmission server each time the user terminal is turned on. The setting information may be edited through the user interface unit 218.

The message controller 214 receives the state information of the user terminal, determines whether to transmit the message accordingly, and transmits the message to the user terminal. For example, it is determined whether the user terminal is in a reception state of the message and transmits the message accordingly. In other words, transmit a response request message for receiving the status information of the user terminal 120 and receive a response signal in response thereto, or after receiving and storing the status information of the user terminal 120 at regular intervals, the message Using a method of checking this before transmission, the user terminal 120 determines whether the message is in a reception possible state and transmits the message to the user terminal in the reception possible state.

Meanwhile, instead of transmitting a message to one user terminal, the message may be controlled to be transmitted to all user terminals of the corresponding group according to the group information included in the message. The transmission of messages for each group will be described later with reference to FIG. 3. As described above, the message header includes a terminal identifier, a group ID, message acknowledgment data, identifier information of a program currently being executed, and so on. The registered message repeatedly transmits the message until the message acknowledgment data is received from the user terminal. It is also possible to transmit a program interworking message for transmitting a message related to a program currently running in a user terminal.

When the message transmitter 216 determines that the user terminal 120 is in a reception state of a message, the message transmitter 216 transmits a message to be transmitted to the user terminal 120 through a bidirectional communication channel. The message transmitter 216 includes a message transmission queue in which a message to be transmitted is stored, and a message waiting queue for temporarily storing a message when the user terminal is not in a message reception state. The user interface unit 218 provides an input / output means for managing a message to be stored in the message storage unit 212 and transmitted to the user terminal 120, that is, a management tool for receiving a new message or editing an existing message. Through this, it is possible to add or delete a message.

The digital TV headend system, the integrated cable operator system (SO), or the digital media center (DMC) system includes an AV data providing unit 224 to create and transmit content. The message converter 222 may be provided. Detailed operations of the message converter 222 will be described later with reference to FIG. 5.

The user terminal 120 includes a message receiving unit 232, a terminal state information transmitting unit 234, a display unit 236, and an AV data reproducing unit 238. The message receiver 232 receives a message from the message transmission server 130. The terminal state information transmitter 234 transmits state information, message receipt acknowledgment information, and the like, including whether the user terminal 120 is in a state in which a user can receive a message, to the message transmission server 130. For example, when power is applied to the user terminal 120, the message transmission server 130 transmits information indicating that the notification message is in a reception state.

The terminal state information is transmitted through a return channel between the content delivery server 110 and the user terminal 120, and is carried on a response signal corresponding to a response request message from the message transmission server 130, or at regular time intervals. Is sent periodically. The display unit 236 decodes the received message and displays the message on the screen. For example, the AV data reproducing unit 238 may overlay and display the currently reproduced program screen. The AV data reproducing unit 238 decodes and reproduces the AV data received from the content delivery server. An example of the AV data may be digital TV broadcast data.

3 is a flowchart illustrating an opt-in message transmission process for each reception group.

The message to be transmitted is read from the database (S305), input to the message transmission queue, and waits for transmission (S310). It is determined whether the message to be transmitted is a broadcast message (S315). If the message is a broadcast message, the message is transmitted to all user terminals (S320). Otherwise, the reception group included in the message is checked (S325). When an application program for receiving a message installed in the user terminal is executed, since the state information of the user terminal 120 is transmitted to the message transmission server 130, the user terminal capable of transmitting the message may be known. In addition, the user information and the group information of the terminal can also be known by searching the database of the message transmission server 130.

Receive groups are included in the message header. When the message receiving group is confirmed, the message is transmitted to user terminals belonging to the corresponding receiving group (S330). It is determined whether or not a response signal is received for a predetermined time (S335). If the response signal is not received, it is sent to the transmission waiting queue and stored and returns to the transmission standby state (S340). When the receiver is able to receive a message later, it moves the message to the message transmission queue and retransmits the message. On the other hand, even in the above-described group-by-group transmission, it is also possible to transmit a message one-to-one instead of transmitting the message to all the terminals belonging to the group at once.

The user terminal then finds out whether the broadcasting message or the multicasting message is a message sent by the destination with reference to the group ID. Of course, one user terminal may belong to one group or a plurality of groups.

4 is a diagram illustrating a protocol for transmitting a registered message.

When power is applied to the user terminal 120, the message transmission server 130 receives the state information of the user terminal 120, stores it in a database, and transmits a registered message to be transmitted according to the user information read from the message transmission server 130. The message storage unit is searched for the presence of a message and the registered message is read and transmitted (S405). When the user terminal 120 receives the registration message and the user clicks on the registration message acknowledgment button to notify that the registration message has been read (S410), the received registration message is displayed (S415). If the user does not click the registration message reception confirmation button, the message transmission server 130 retransmits the registration message at a preset time interval. That is, the message transmission server 130 determines whether or not to receive the registration message after a predetermined time elapses (S420), and if the reception confirmation message is not received, retransmits the registration message at regular time intervals (S425). When the acknowledgment message is transmitted from the user terminal 120 (S430), the transmission of the registered message is terminated (S435). On the other hand, when the user does not click the acknowledgment button, as described above, instead of unconditionally retransmitting the registered message, it is possible to display a message asking whether to confirm the receipt again.

FIG. 5 is a reference diagram for explaining a process in which a message transmission server transmits only a message template, and the SO / DMC converts it into a message for each recipient and delivers the message to a user terminal.

Referring to FIG. 5, the message transmission server 510 transmits only message templates to the plurality of SO / DMCs 510-1 and 520-n, and details thereof are determined by using user information subscribed to the SO / DMC. It can be seen that the message can be converted and transmitted to each of the user terminals 530-1 and 540-1.

For example, if the message transmission server 510 transmits only the message template, "User corresponding to the terminal identifier, spring sale at the ooo department store of <subscriber area>", the SO / DMC (510-1) ) Has user information, and uses it to convert the message that reflects the user information "Hong Gil-dong, spring sale at the ooo department store in Samseong-dong" to transmit the converted message to each user terminal. Then, the message transmission server 510 does not have to process and transmit a message for every subscriber one by one, thereby increasing transmission efficiency.

6 is a diagram illustrating an example of a screen for receiving a multimedia opt-in message.

If a message is received while receiving a broadcast, its contents can be displayed in the form of subtitles. For example, you can display the following message: "Notice ooo. The apparel exhibition will be held at department store xx from day xx to day xx." Alternatively, messages that require user confirmation can be displayed on a specific part of the screen rather than flowing subtitles and accepted through the user interface. For example, you can display the message "ooo has received a multimedia message. Click here to check it." If the user clicks on it, the message content can be displayed as a flowing subtitle. Such a message may be a multimedia message. That is, the image, audio, video, application program, etc. may be combined.

For example, an application program combined with a message may receive a message indicating a home shopping broadcast using various one-way or two-way application services such as channel movement, coupon reception, survey, etc., and then when the user presses a confirmation button, the corresponding home shopping channel You can go to or receive a coupon after receiving a message. The audio, video, application, etc. included in the multimedia compound message may be included together in the message and transmitted, or the message may include only a reference link to the message and may receive the actual content to be displayed when the user terminal displays the message.

The user may also be given a discount on the fee, points, etc. in exchange for receiving such a message. The message transmission server records the acknowledgment information of the user terminal. For example, information about the number of readings, message types, and the like is recorded by date and month to give points, and the points can be used for viewing fee discounts.

7 illustrates a format of a multimedia opt-in message according to an embodiment of the present invention.

The multimedia opt-in message includes a message header 710 and a message body 720. The message header 710 includes a registered transmission field 710, a terminal identifier field 702, a group ID field 703, a reserved display field 711, a repetition count field 712, and a display time interval field 713. , Priority field 705, and coordinated program identifier field 706.

The registration transmission field 701 is a field for requesting message reception indicating that the reception of a message is completed from the receiver of the user terminal as described above. If this field is set, the receiver as described above with reference to FIG. 4. Continue resending the message until it reads the message. The terminal identifier field 703 records the identifier of the terminal to receive this message. The group ID field 703 records the ID of the group to receive this message. A detailed process of transmitting the message with reference to the group ID field 703 is as described above with reference to FIG. 3.

On the other hand, it is also possible to reserve a display for when to display the received message. The reserved display field 711 is a field for storing whether to display or not according to a reserved condition at the reserved time and reserved time information. The repeat count field 712 is a field for storing the repeat count of the display at a reserved time. The display time interval field 713 is a field for storing how much time interval to display upon repeating the display. Accordingly, for example, the information for repeatedly displaying the received message three times at five-minute intervals at 6 pm on May 1 may be stored. The repetition count field 712 and the display time interval field 713 may be used to repeatedly display an acknowledgment message regardless of reservation. For example, if the user does not click the acknowledgment button when transmitting the registered message, instead of retransmitting the registered message unconditionally, the received message is received according to the values of the repeat count field 712 and the display time interval field 713. You can have it redisplay the message asking for confirmation.

The priority field 705 records information on the transmission order when a plurality of messages are to be transmitted at the same time. For example, the message recorded as '1' may be transmitted before the message recorded as '2', or the priority may be recorded by dividing into steps such as 'high', 'medium' and 'low'. On the other hand, when a user terminal receives a message when the power is turned on, the user terminal first receives a message having the highest priority or receives a message having the highest priority when several messages are received at the same time. .

The coordinated program identifier field 706 is an identifier of a program to be reproduced in association with a program being reproduced in the user terminal.

Meanwhile, a retransmission count field, a retransmission interval field, and a reservation transmission time field may be further included for retransmission in case of a reserved transmission and a transmission error. The number of retransmissions field records the number of retransmissions, how many times the message is retransmitted when the terminal is powered off or fails to transmit due to various other errors. In the retransmission interval field, time interval information for retransmission at the time of retransmission of a message is recorded, and a reserved transmission time of the message is recorded in the reserved transmission time field.

On the other hand, the above-described message transmission and reception method can be created by a computer program. Codes and code segments constituting the program can be easily inferred by a computer programmer in the art. In addition, the program is stored in a computer readable media (computer readable media), and read and executed by a computer to implement a method for transmitting and receiving messages. The information storage medium includes a magnetic recording medium, an optical recording medium, and a carrier wave medium.

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

As described above, according to the present invention, it is possible to check whether the user has read the message by transmitting a message specialized for each user or group in the form of a general message or a registered message according to the state of the terminal. In addition, the form of the message may be in the form of a complex message combining text, images, video, etc., or by giving priority to various applications.

Claims (16)

delete delete A message storage unit for storing a multimedia opt-in message to be transmitted to a user terminal agreeing to receive a message; A message controller which receives terminal state information from the user terminal and controls transmission of the message with reference to header information of the multimedia opt-in message; And A message transmitter for transmitting the multimedia opt-in message to the user terminal according to a predetermined communication method, The multimedia opt-in message transmission device, characterized in that it comprises a registered transmission field specifying whether to repeatedly transmit the message at a predetermined time interval until the acknowledgment signal from the user terminal is received. A message storage unit for storing a multimedia opt-in message to be transmitted to a user terminal agreeing to receive a message; A message controller which receives terminal state information from the user terminal and controls transmission of the message with reference to header information of the multimedia opt-in message; And A message transmitter for transmitting the multimedia opt-in message to the user terminal according to a predetermined communication method, The multimedia opt-in message transmission device, characterized in that it comprises a reserved display whether to specify whether to display repeatedly the multimedia opt-in message at a predetermined number of times set at a predetermined time. The method of claim 3 or 4, wherein the multimedia opt-in message And a priority field for specifying a transmission order when a plurality of multimedia opt-in messages are to be transmitted at the same time. The method of claim 3 or 4, wherein the multimedia opt-in message The multimedia opt-in message transmission device comprising an identifier field of the program when transmitted in association with a program being played. The method of claim 3 or 4, wherein the multimedia opt-in message Multimedia opt-in message transmission device comprising image, audio or video data, and further comprising an application program executed in combination with the data. The method according to claim 3 or 4, And the user terminal is a set-top box for receiving digital broadcasts. delete delete (a) reading a message from a message storage unit storing a multimedia opt-in message to be transmitted to a user terminal agreeing to receive a message; (b) receiving terminal status information from a user terminal and controlling transmission of the message with reference to header information of the multimedia opt-in message; And (c) transmitting the multimedia opt-in message to the user terminal according to a predetermined communication method, The multimedia opt-in message transmission method of the multimedia opt-in message characterized in that it comprises a registered transmission field for specifying to repeatedly transmit the message at a predetermined time interval until the reception confirmation signal from the user terminal. The method of claim 11, wherein step (b) And setting a user terminal of the group as a destination of the multimedia opt-in message with reference to a group ID included in the header of the multimedia opt-in message. delete delete In the information storage medium recording the data structure of the multimedia opt-in message, A group ID field for designating to transmit the multimedia opt-in message to a user terminal of a corresponding group; A registered transmission status field for designating and repeatedly transmitting the message repeatedly at predetermined time intervals until an acknowledgment signal from the user terminal is received; A reserved display field for specifying and storing the message repeatedly displayed at a set repetition frequency at a set time; A repetition number field for storing a repetition number for displaying the message at the reserved time; A display time interval field for storing a display time interval of the message; A priority field for designating and storing a transmission order when a plurality of messages are to be transmitted at the same time; And And a program identifier field for storing an identifier of the program when transmitted in association with a program being played. The method of claim 15, A retransmission count field for designating and storing the number of retransmissions in case of a transmission error of the opt-in message; A retransmission interval field for designating and storing a time interval for retransmission at the time of retransmission; And And at the time of the scheduled transmission of the opt-in message, a reservation transmission time field for storing a scheduled transmission time.

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