JP2012123736A - Data presentation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data presentation system capable of preventing the leakage of confidential information.SOLUTION: A data presentation system includes: multiple portable terminals 3 each of which is the presentation destination of data being an electronic file consisting of multiple pages and displays the data for each page; and a server 2. The server 2 includes: authority imparting means for imparting host authority or guest authority to each of the portable terminals 3; download means for allowing the whole multiple portable terminals 3 to download the data selected by the portable terminal with the host authority imparted thereto; reception means for receiving update information concerning a displayed page transmitted from the portable terminal with the host authority imparted thereto; transmission means for transmitting the update information concerning the displayed page to the whole or a part of the portable terminals other than the portable terminal which has transmitted the update information concerning the displayed page among the multiple portable terminals 3; and forcible cancellation means for allowing the whole portable terminals 3 to cancel the data when the presentation of the data is terminated.

Description

  The present invention relates to a material presentation system that presents materials used in conferences, seminars, lectures, sales activities, and the like to a plurality of portable terminals.

  In recent years, materials used in conferences, seminars, lectures, sales activities, etc. in order to reduce the burden on the global environment and reduce the cost of materials (paper costs, printing costs, labor costs for maintenance, maintenance costs, etc.) Paperless. For example, Patent Document 1 discloses an electronic conference system capable of making paper-less materials used in a conference.

JP 2010-33229 A (paragraph 0011, FIG. 2)

  In the electronic conference system disclosed in Patent Document 1, each conference terminal device stores the document after the conference terminal device having the presenter authority transmits the document to another conference terminal device via the network. . For this reason, if the confidential information is included in the material stored in each conference terminal device, the confidential information may be leaked. In particular, when the conference terminal device is a portable terminal, the possibility of the conference terminal device being stolen or lost is higher than when the conference terminal device is a stationary device, and thus there is a higher possibility of leakage of confidential information. .

  An object of this invention is to provide the data presentation system which can prevent leakage of confidential information in view of said situation.

  In order to achieve the above object, a server according to the present invention is a server that can communicate with a plurality of portable terminals that are presentation destinations of materials, which are electronic files consisting of a plurality of pages, and that can display each page of the materials. An authority granting unit that grants either a host authority or a guest authority to each of the plurality of mobile terminals, and a material selected by the mobile terminal to which the host authority is granted, Download means for downloading, receiving means for receiving update information related to a display page transmitted from a mobile terminal to which the host authority has been granted, and a mobile terminal that has transmitted update information related to the display page among the plurality of mobile terminals Transmitting means for transmitting update information related to the display page to all or a part of the mobile terminals, and at the end of presentation of the document, A configuration and a forced discarding means for discarding the article to all of the plurality of mobile terminals.

  According to such a configuration, since the compulsory discarding unit that causes all of the plurality of mobile terminals to discard the material at the end of the presentation of the material is provided, the material is a presentation destination of the material that is an electronic file including a plurality of pages. By constructing a material presentation system together with a plurality of portable terminals capable of displaying each page, it is possible to realize a material presentation system that can prevent leakage of confidential information.

  Further, in the server configured as described above, the authority granting unit grants master authority (for example, chairman authority) only to one of the mobile terminals to which host authority is granted, and the download unit is granted master authority. It is desirable that the material selected by the mobile terminal is downloaded to all of the plurality of mobile terminals, and the receiving unit receives update information regarding the display page transmitted from the mobile terminal to which the master authority is granted. As a result, even when there are a plurality of portable terminals to which the host authority is granted, there is no possibility of confusion in changing the display page.

  In order to achieve the above object, a material presentation system according to the present invention includes a plurality of portable terminals, which are presentation destinations of materials that are electronic files composed of a plurality of pages, and capable of displaying each page of the materials. It is a structure provided with the server of the said either structure which can communicate with a portable terminal.

  In the document presentation system configured as described above, each of the plurality of mobile terminals has a switching function between a synchronous mode and an asynchronous mode, and update information regarding the display page is transmitted between the mobile terminal in the asynchronous mode and the server. Updates related to the display page that is not transmitted / received, or ignores update information related to the display page transmitted from the mobile terminal in which the server is in the asynchronous mode, and is transmitted from the server in the mobile terminal that is in the asynchronous mode. It is desirable to ignore information. Thereby, the freedom of material browsing can be increased in each of the plurality of mobile terminals. For example, by setting the mobile terminal with guest authority to asynchronous mode, the mobile terminal with guest authority can freely display any page regardless of the mobile terminal with host authority. The user of the portable terminal to which the guest authority is granted can enhance the thinking and imagination based on the material. On the other hand, by returning the mobile terminal with guest authority from asynchronous mode to synchronous mode, the same page as the mobile terminal with host authority can be displayed. Users can smoothly exchange information and opinions regarding materials with users of portable terminals to which host authority is granted.

  According to the present invention, it is possible to realize a material presentation system that can prevent leakage of confidential information.

It is a figure which shows the structure of the meeting material presentation system which concerns on one Embodiment of this invention. It is a figure which shows the structural example of a server. It is a figure which shows the structural example of a portable terminal. It is a figure which shows the example of a login screen. It is a figure which shows the example of a virtual meeting room selection screen. It is a figure which shows the example of a file selection screen. It is a figure which shows the example of a file display screen. It is a figure which shows the other example of a file display screen.

  Embodiments of the present invention will be described below with reference to the drawings. Here, as one embodiment of the present invention, a conference material presentation system that presents conference materials on a plurality of portable terminals will be described.

<System configuration>
First, the system configuration will be described. FIG. 1 shows the configuration of a conference material presentation system according to an embodiment of the present invention. A conference material presentation system according to an embodiment of the present invention includes a registration device 1, a server 2, and a plurality of mobile terminals 3.

  The registration device 1 registers, changes, and deletes various management information and conference materials with respect to the server 2.

  As the registration device 1, for example, a personal computer can be used. In FIG. 1, only one registration device 1 is shown, but there may be a plurality of registration devices 1. Further, when the server 2 is, for example, a notebook personal computer, the server 2 can also serve as the registration device 1.

  For example, as illustrated in FIG. 2, the server 2 includes a control unit 21 that controls the entire server, a communication unit 22 that communicates with the registration device 1 and each mobile terminal 3, and a database 23.

  For example, as shown in FIG. 3, the mobile terminal 3 includes a control unit 31 that controls the entire mobile terminal, a storage unit 32 that stores an operating system (OS) of the mobile terminal, various application software, various data, and the like. The communication unit 33 that communicates with the server 2, the display unit 34, and the operation unit 35 are provided. Examples of the operation unit 35 include a touch panel provided on the display screen of the display unit 34, but may be an input key or the like. The mobile terminal 3 has installed application software for conference material presentation system, and by launching the application software for conference material presentation system, the conference material is displayed on the display screen of the display unit 35 by communication with the server 2. It becomes possible to display.

  The mobile terminal 3 communicates with the server 2 via the Internet via a wireless LAN access point or via a mobile phone network. The plurality of mobile terminals 3 may be only mobile terminals of the same vendor, or may include mobile terminals of different vendors.

  As the portable terminal 3, for example, a tablet computer such as iPad (trademark of Apple) or a smartphone such as iPhone (trademark of Apple) can be used.

<Account management by system administrator>
Next, account management by the system administrator in the conference material presentation system according to an embodiment of the present invention shown in FIG. 1 will be described.

  The conference material presentation system according to one embodiment of the present invention shown in FIG. 1 requires registration because various management information necessary for system operation is not registered in the database 23 of the server 2 in the initial setting state. It is.

  First, a person who should become a system administrator registers a system administrator account in the database 23 of the server 2 using the registration device 1. In this system administrator account registration, in addition to the system administrator account ID, an initial password associated with the system administrator account ID is also stored in the database 23 of the server 2.

  After registering the system administrator account, the system administrator inputs the system administrator account ID and the initial password associated with the system administrator account ID to the registration device 1 to access the server 2 as a system administrator. be able to. Only the system administrator can register another system administrator account in the database 23 of the server 2 by using the registration device 1 in a state where the server 2 is accessed as the system administrator. Thus, the system administrator can be singular or plural.

  Further, the system administrator can register the secretariat account in the database 23 of the server 2 by using the registration device 1 while accessing the server 2 as the system administrator. In this secretariat account registration, in addition to the secretary account ID, an initial password associated with the secretary account ID is also stored in the database 23 of the server 2. As with the system administrator, the secretariat may be singular or plural.

  Further, the system administrator can register the conference participant account in the database 23 of the server 2 by using the registration device 1 while accessing the server 2 as the system administrator. In this conference participant account registration, in addition to the conference participant account ID, an initial password associated with the conference participant account ID is also stored in the database 23 of the server 2. Since the conference is held with the participation of a plurality of people, a plurality of conference participants are registered.

  Further, the system administrator can change the passwords of all accounts using the registration device 1 while accessing the server 2 as a system administrator.

  The conference material presentation system according to an embodiment of the present invention shown in FIG. 1 does not include a means for notifying the registration target person of the contents of the account registration, but may include the means. The means for notifying the registration target person of the contents of the account registration includes, for example, means for notifying the registration target person of the contents of the account registration by e-mail.

<Account management by secretariat>
Next, account management by the secretariat in the conference material presentation system according to an embodiment of the present invention shown in FIG. 1 will be described.

  The secretariat can register the conference participant account in the database 23 of the server 2 by using the registration device 1 while accessing the server 2 as a secretary. That is, in addition to the system administrator, the secretariat can also register the conference participant account. In this conference participant account registration, in addition to the conference participant account ID, an initial password associated with the conference participant account ID is also stored in the database 23 of the server 2.

  Further, the secretariat can change the password only for the user account and the conference participant account by using the registration device 1 while accessing the server 2 as the secretary.

<Virtual meeting room management by system administrator>
Next, the management of the virtual conference room by the system administrator in the conference material presentation system according to the embodiment of the present invention shown in FIG. 1 will be described.

  The system administrator can register the virtual conference room in the database 23 of the server 2 using the registration device 1 while accessing the server 2 as the system administrator, and can also register the registered virtual conference room. It is also possible to change attributes and delete registered virtual conference rooms. Only the system administrator can manage the virtual conference room itself. The attributes of the virtual meeting room include, for example, types of meetings such as a management meeting, a headquarters meeting, and a business planning meeting.

  While accessing the server 2 as a system administrator, the system administrator assigns a secretary account with administrative authority to each virtual conference room using the registration device 1, and assigns the assignment result to the database of the server 2. 23 can be registered. The account that can be assigned to the virtual conference room by the system administrator is only the secretary account.

<Management of meeting materials by secretariat>
Next, management of conference materials by the secretariat in the conference material presentation system according to an embodiment of the present invention shown in FIG. 1 will be described.

  The secretary uses the registration device 1 while accessing the server 2 as a secretary to specify a desired virtual meeting room from among virtual meeting rooms for which the account has management authority, and designates the designated virtual meeting room. In association with the conference room, conference material (for example, a file in PDF format) can be registered in the database 23, and the registered conference material can be deleted.

<Management of meeting participants by secretariat>
Next, management of conference participants by the secretariat in the conference material presentation system according to an embodiment of the present invention shown in FIG. 1 will be described.

  The secretary uses the registration device 1 while accessing the server 2 as a secretary to specify a desired virtual meeting room from among virtual meeting rooms for which the account has management authority, and designates the designated virtual meeting room. The conference participant account of the conference participant who can enter the conference room can be registered in the database 23, and the entry authority attribute (host privilege or guest privilege) of the conference participant account of the registered conference participant who can enter the conference room Can be changed in units of conference participants for each virtual conference room, and the conference participant accounts of registered conference participants who can enter the room can be deleted.

<Congress progress>
When each registration described above is completed, it is possible to proceed with the conference using the conference material presentation system according to the embodiment of the present invention shown in FIG. Hereinafter, the progress of the conference using the conference material presentation system according to the embodiment of the present invention shown in FIG. 1 will be described. In order to simplify the explanation, the progress of the conference in which three participants, the conference participant A, the conference participant B, and the conference participant C participate, will be described.

  When each of the conference participant A, conference participant B, and conference participant C operates the operation unit 35 of their mobile terminal 3 to start up the application software for the conference material presentation system, a login screen is displayed on the display unit 34. Is displayed. As an example of the login screen, there is a login screen on which conference participant account ID and password input fields and soft keys as shown in FIG. 4 are displayed. When the input of the conference participant account ID and password is completed, the mobile terminal 3 transmits the conference participant account ID and password to the server 2, and the server 2 performs authentication, and if the login is successful, the mobile terminal 3 transmits from the mobile terminal 3. The list information of the virtual conference rooms that can be entered with the conference participant account ID that has been sent is returned to the mobile terminal 3, and if the login fails, a notification that the login has failed is returned to the mobile terminal 3.

  When each of the conference participant A, the conference participant B, and the conference participant C has successfully logged in, the display screen of each mobile terminal 3 is switched from the login screen to a virtual conference room selection screen as shown in FIG. The virtual conference room selection screens of the mobile terminals 3 of the conference participant A, the conference participant B, and the conference participant C reflect the content of management of the conference participants by the secretariat. When a certain virtual conference room is selected on the virtual conference room selection screen, the portable terminal 3 transmits information regarding the selection to the server 2.

  Here, it is assumed that each of conference participant A, conference participant B, and conference participant C selects “business planning conference 1” on the virtual conference room selection screen shown in FIG. It is assumed that “sales planning meeting 1” is selected in the order of conference participant C, conference participant A, and conference participant B. In this case, the mobile terminal 3 of the conference participant C enters the “sales planning meeting 1” with “guest authority”, and then the mobile terminal 3 of the conference participant A becomes “sales planning meeting 1” with “host authority”. Finally, the portable terminal 3 of the conference participant B enters the “business planning meeting 1” with “host authority”.

  In the conference material presentation system according to the embodiment of the present invention shown in FIG. 1, when a mobile terminal 3 to which “host authority” is given to a certain virtual conference room enters a certain virtual conference room. The conference progress data relating to the virtual conference room where the room has entered is newly created in the database of the server 2. Therefore, when the mobile terminal 3 of the conference participant C enters the “sales planning meeting 1” with “guest authority”, a notification that the “sales planning meeting 1” has not started is sent from the server 2 to the mobile terminal of the conference participant C. 3 until the mobile terminal 3 of the conference participant A enters the “sales planning meeting 1” with “host authority” on the display unit 34 of the mobile terminal 3 of the conference participant C “sales planning meeting 1”. "Is not started, and when the mobile terminal 3 of the conference participant A enters the" Sales Planning Meeting 1 "with" Host Authority ", the conference progress data regarding the" Sales Planning Meeting 1 "is stored on the server. 2 is newly created in the database 2. For this reason, the mobile terminal 3 of the conference participant C once returns to the virtual conference room selection screen, and after the mobile terminal 3 of the conference participant A enters the “sales planning meeting 1” with “host authority”, the “sales planning” An operation to re-enter the conference 1 is required. Note that the conference progress data related to “Sales Planning Meeting 1” includes the addition of a mobile terminal to enter the room, the grant of “chairman authority”, which will be described later, and the conference material by the chairman terminal (mobile terminal 3 to which “chairman authority” is granted). Change the display page of the conference material on the chairperson's terminal when the chairperson's terminal is in synchronous mode, change the conference material to be displayed on the chairperson's terminal when the chairperson's terminal is in synchronous mode, It is updated when there is a change.

  Further, in the conference material presentation system according to an embodiment of the present invention shown in FIG. 1, the “chairman authority” is given to the terminal that has entered the virtual meeting room first with “host authority”, and the server 2 The list information of the files associated with the virtual conference room that has entered the room is sent only to the portable terminal 3 to which “chairman authority” is granted. Therefore, “chairman authority” is given to the mobile terminal 3 of the conference participant A, and only the display screen of the mobile terminal 3 of the conference participant A is changed from the virtual conference room selection screen to the file selection screen as shown in FIG. Switch. The file selection screen reflects the contents of management of meeting materials by the secretariat. When a certain file is selected on the file selection screen, the portable terminal 3 transmits information regarding the selection to the server 2.

  Here, it is assumed that the conference participant A selects “document 1.pdf” on the file selection screen shown in FIG. When the mobile terminal 3 of the conference participant A who is the chairman terminal selects “Document 1.pdf”, the server 2 adds “Document 1” to each mobile terminal 3 of the conference participant A, the conference participant B, and the conference participant C. Download ".pdf". When the download is completed, one page of “Document 1.pdf” is displayed on each display screen of each mobile terminal 3 of conference participant A, conference participant B, and conference participant C as shown in FIG. The

  Thereafter, when the conference participant A changes the display page of “Document 1.pdf” by operating the operation unit 35, the display page change information is sent to the server 2, and the conference progress data regarding “Sales Planning Conference 1”. Is updated. Further, the conference participant A can return to the file selection screen as shown in FIG. 6 by operating the operation unit 35 and change the conference material to be displayed. When the conference material that is the display target is changed, the conference material that is the display target before the change is deleted from the storage unit 32 of the mobile terminal 3 of the conference participant A who is the chairman terminal, and the display after the change is made The target conference material is newly downloaded to the mobile terminal 3 of the conference participant A who is the chairman's terminal.

  However, when the mobile terminal 3 of the conference participant A who is the chairperson terminal is in the asynchronous mode by operating the “synchronous / asynchronous switching” soft key (see FIG. 7), the display page and the conference material to be displayed are displayed. Even if it is changed, the mobile terminal 3 of the conference participant A who is the chairman terminal does not send the display page change information or the change information of the conference material to be displayed to the server 2 or is the chairman terminal. When the mobile terminal 3 of the conference participant A enters the asynchronous mode, the mobile terminal 3 of the conference participant A who is the chairman terminal notifies the server 2 to that effect, and the server 2 is the conference participant A who is the chairman terminal. During the period when the mobile terminal 3 is in the asynchronous mode, even if the change information of the display page or the change information of the conference material to be displayed is sent from the mobile terminal 3 of the conference participant A who is the chairperson terminal, 1 " So that it does not update the meeting progress data about.

  On the other hand, the mobile terminal 3 of the conference participant B and the mobile terminal 3 of the conference participant C who are not chairperson terminals are polling the server 2 at regular intervals (for example, at intervals of 2 seconds). When it is determined that there is a change in the display page of the mobile terminal 3 of the conference participant A who is the chairman terminal or the conference material to be displayed based on the conference progress data regarding The display page of the conference material to be displayed is matched (synchronized) with the display page of the conference material displayed on the display screen of the mobile terminal 3 of the conference participant A who is the chairman terminal. Therefore, until it is determined that the display page of the mobile terminal 3 of the conference participant A who is the chairman's terminal and the conference material to be displayed are changed, the mobile terminal 3 and the conference of the conference participant B who is not the chairman's terminal The mobile terminal 3 of the participant C can display an arbitrary page of the conference material that is downloaded by the participant C and stored in the storage unit 32. When the conference material to be displayed is changed, the conference material to be displayed before the change is the storage unit 32 of the mobile terminal 3 of the conference participant B who is not the chair terminal and the mobile terminal 3 of the conference participant C. The conference material that is the display target after the change is newly downloaded to the mobile terminal 3 of the conference participant B and the mobile terminal 3 of the conference participant C that are not the chairman's terminal.

  However, when the mobile terminal 3 of the conference participant B who is not the chairman terminal is in the asynchronous mode by the operation of the “synchronization / asynchronous switching” soft key (see FIG. 7), the mobile terminal 3 of the conference participant B who is not the chairman terminal is The server 2 is not polled, or is polled, but the update is ignored even if the conference progress data regarding the “business planning meeting 1” is updated. Similarly, when the mobile terminal 3 of the conference participant C who is not the chairman terminal is in the asynchronous mode by operating the “synchronous / asynchronous switching” soft key (see FIG. 7), the mobile terminal 3 of the conference participant C who is not the chairman terminal. Is configured not to poll the server 2 or to perform polling but ignore the update even if the conference progress data regarding the “business planning conference 1” is updated.

  As described above, the synchronization of the conference material to be displayed and the display page of the conference material between the chairman terminal and the non-chairman terminal in the synchronous mode is not the exchange of the conference material itself but the conference progress data. Therefore, there is an advantage that the load on the communication line is small.

  In the state shown in FIG. 7, when the “chairperson right acquisition” soft key (see FIG. 7) of the mobile terminal 3 of the conference participant B who is not the chairman terminal but has “host authority” is pressed, the chairperson Is sent from the mobile terminal 3 of the conference participant B to the server 2, the conference progress data regarding the “business planning conference 1” is updated, and the state transitions to the state shown in FIG.

  In addition, in the state shown in FIG. 7 or the state shown in FIG. 8, when the “conference end” soft key of the chairman terminal is pressed, instruction information on the end of the meeting is sent from the chairman terminal to the server 2. The server 2 sends an instruction to discard the conference material to all the mobile terminals 3 entering the “sales planning meeting 1” in response to the instruction information for closing the meeting. The conference progress data is deleted from the database 23. All the mobile terminals 3 entering the “business planning meeting 1” delete the meeting material stored in the storage unit 32 in response to the instruction to discard the meeting material.

  When the “logout” soft key of any one of the mobile terminals 3 is pressed in the state shown in FIG. 7 or the state shown in FIG. 8, the mobile terminal 3 to which the “logout” soft key is pressed The conference material stored in the server 2 is deleted, and at the same time, a request for deleting the own login information is sent to the server 2 so that the own login information on the server 2 is also deleted.

  In consideration of the case where normal conference termination or normal logout cannot be performed, processing for deleting conference materials that may be stored in the storage unit 32 when the conference material presentation system application software is started. It is desirable to do so. Also, exit the application software for the conference material presentation system so that there is no leakage of confidential information even if there is a conference participant who ends the application software for the conference material presentation system without closing the conference or logging out. It is desirable to execute a process of deleting conference materials that may be stored in the storage unit 32 at times.

  As described above, since the conference material is not left on the mobile terminal 3 side after the conference, after logout, or after the application software for the conference material presentation system, leakage of confidential information can be prevented. .

  As mentioned above, although embodiment which concerns on this invention was described, the range of this invention is not limited to this, A various change can be added and implemented in the range which does not deviate from the main point of invention.

  For example, when the OS of the mobile terminal 3 is a multitasking OS, application software capable of making a voice call is installed in the mobile terminal 3, and application software for a conference material presentation system and application software capable of making a voice call are executed. This eliminates the need for a separate telephone conference system.

  When an arbitrary position in the display page of the conference material to be displayed is designated as the pointer position in the chairman terminal, pointer position information is sent from the chairman terminal to the server 2, and the server 2 Depending on the information, the conference progress data of the virtual conference room in which the chairperson's terminal has entered may be updated. According to such a configuration, the pointer position can be highlighted, for example, on the display screen of each portable terminal, and the chairperson can suggest other conference participants which part of the display page should be noted. .

  In the above-described embodiment, “chairman authority” is provided, but “chairman authority” may not be provided. In this case, it is conceivable to provide a “host / guest switching” soft key on the display screen of the portable terminal having “host authority”. By using the “host / guest switching” soft key, if the number of host terminals is always one, the same result as the above-described embodiment can be obtained. However, the number of host terminals is not always one, and a plurality of hosts can be obtained. Each terminal sends display page change information to the server, which may cause confusion in the display page change. For this reason, it is preferable to provide a “chairman authority”.

  In the above-described embodiment, the mobile terminal that is not the chairperson terminal polls the server at regular intervals. Instead, the server is a mobile terminal that is not the chairperson terminal each time the conference progress data is updated. You may make it the structure which sends the meeting progress data updated to the terminal.

  In the above-described embodiment, the conference material is deleted regardless of the type of the conference material on the mobile terminal 3 after the conference ends or after logout. However, an attribute related to the necessity of deletion is added to each conference material. The conference material that does not need to be deleted may not be deleted.

DESCRIPTION OF SYMBOLS 1 Registration apparatus 2 Server 3 Portable terminal 21 Control part 22 Communication part 23 Database 31 Control part 32 Storage part 33 Communication part 34 Display part 35 Operation part

Claims (4)

A server capable of communicating with a plurality of mobile terminals capable of displaying each page of the document, which is a presentation destination of the document which is an electronic file consisting of a plurality of pages,
Authority granting means for granting either host authority or guest authority to each of the plurality of mobile terminals;
Download means for downloading the material selected by the mobile terminal to which the host authority is granted to all of the plurality of mobile terminals;
Receiving means for receiving update information regarding a display page transmitted from the mobile terminal to which the host authority is granted;
Transmitting means for transmitting update information about the display page to all or a part of mobile terminals other than the mobile terminal that has transmitted update information about the display page among the plurality of mobile terminals;
A server, comprising: a compulsory discarding unit that causes all of the plurality of mobile terminals to discard the document when presentation of the document ends. The authorization means grants master authority only to one of the mobile terminals to which host authority is granted,
The download means downloads the material selected by the mobile terminal to which the master authority is granted to all of the plurality of mobile terminals,
The server according to claim 1, wherein the receiving unit receives update information regarding a display page transmitted from a mobile terminal to which the master authority is granted. A plurality of portable terminals that are presentation destinations of materials that are electronic files consisting of a plurality of pages and that can display each page of the materials;
A material presentation system comprising: the server according to claim 1 or 2 capable of communicating with the plurality of portable terminals. Each of the plurality of mobile terminals has a switching function between a synchronous mode and an asynchronous mode,
Update information related to the display page is not transmitted / received between the mobile terminal in asynchronous mode and the server, or update information related to the display page transmitted from the mobile terminal in which the server is in asynchronous mode is ignored. The material presentation system according to claim 3, wherein the portable terminal in the asynchronous mode ignores the update information regarding the display page transmitted from the server.

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