JPH11331199A - Electronic conference system, terminal equipment and shared image control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic conference system, with which a difference in the display contents of an image shared by respective terminals can be kept small, when the load of a network is high. SOLUTION: This electronic conference system has a shared image for displaying shared data on respective plural terminals 100 connected via a network 120, measures the load conditions of the network repeatedly at prescribed timing, and when the measured result provided by this measurement satisfies the first condition, operation to be performed from a user to the data displayed in the shared image is inhibited completely or partially, but when the measured result satisfies the second condition, the inhibited operation is enabled again.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electronic conference system having a shared screen for displaying shared data on a plurality of terminals connected via a network, a terminal device, and a shared screen control method.

[0002]

2. Description of the Related Art A conventional electronic conference system having a shared screen for displaying the same data includes a shared whiteboard system. In the shared whiteboard system, LAN and WAN
A white board window corresponding to the shared screen is displayed on each terminal connected via a network such as a terminal, and changes made by the user of each terminal on the white board window, such as drawing and erasing of drawing data, are performed in real time on other terminals. , And whiteboard windows of all terminals are displayed. As a result, even a remote user can proceed with the conference while referring to the same data.

In the electronic conference system having such a shared screen, there are the following two methods for updating the shared screen. The first method is that, when the same data (hereinafter, referred to as shared data) displayed by each terminal on a shared screen is changed, only the changed portion is transmitted to another terminal via a network. The other terminal that has transmitted and received the changed content updates the shared data of its own terminal based on the changed content. The second method is that when a change is made to the shared data, the entire shared data is transmitted to another terminal via a network, and the other terminal displays the received shared data on a shared screen. is there.

[0004] However, in any of these methods, even if a change is made to the shared data when the network is under heavy load, it cannot be transmitted immediately. Takes a lot of time. Therefore, there is a problem in that a difference occurs in the display content of the shared screen between the terminal that has made the change and the terminal that updates the shared data after receiving the change.

Further, conventionally, the user cannot easily know that transmission to another terminal is delayed, so that the shared data is changed one after another even when the network is under heavy load. There is a problem that the difference between the displayed contents is enlarged.

[0006]

As described above, conventionally, even if a change is made to shared data when the network is under heavy load, the data cannot be transmitted immediately. It takes a lot of time to arrive at a terminal. Therefore, there is a problem that a difference occurs in the display content of the shared screen between the terminal that has made the change and the terminal that changes the shared data after receiving the change.

In the past, users could not easily know that transmission to other terminal devices was delayed, so even if the network was under heavy load, the shared data was changed one after another. There is a problem that the difference between the displayed contents is enlarged.

The present invention has been made in view of the above circumstances, and has an electronic conference system, a terminal device, and a terminal capable of keeping a difference in display contents of a shared screen of each terminal small when a network is under heavy load. It is an object to provide a shared screen control method.

[0009]

Means for Solving the Problems The present invention (claim 1) provides:
An electronic conference system having a shared screen for displaying shared data on each of a plurality of terminals connected via a network, wherein each of the terminals includes a measuring unit configured to measure a state of a load on the network. An operation prohibition unit that prohibits all or a part of an operation performed by a user on data displayed on the shared screen based on a measurement result by the measurement unit; and A prohibition operation canceling means for making the operation prohibited by the operation prohibiting means operable again.

[0010] The present invention (claim 2) provides a sharing system for exchanging data with one or more other terminal devices connected via a network to display the shared data. A terminal device having a screen, comprising: a measuring unit that measures a state of a load on the network; and an operation performed by a user on data displayed on the shared screen based on a measurement result by the measuring unit. An operation prohibition unit that prohibits all or part of the operation, and a prohibition operation release unit that enables the operation prohibited by the operation prohibition unit to be operated again based on a measurement result by the measurement unit. And

[0011] This makes it possible to keep the difference between the display contents of the shared screen of each terminal small. Preferably, a prohibition operation setting means for setting an operation to be prohibited by the operation prohibition means may be further provided.

[0012] This makes it possible to make detailed settings such that the difference is kept small only in the portion of the shared data displayed on the shared screen of each terminal that needs to keep the difference small.

Preferably, the operation prohibiting means determines prohibition of the operation based on the measurement result, and the prohibited operation canceling means determines resumption of the prohibited operation based on the measurement result. An algorithm setting means for setting an algorithm may be further provided.

[0014] This allows the user or the like to adjust the size of the difference in the shared data displayed on the shared screen according to the situation, so that the difference in the shared data can be recognized even when the network environment to be used changes. Can be maintained at a desired size.

Preferably, the apparatus may further include display means for displaying a result of measurement by the measurement means. Thereby, the user can grasp the status of the load on the network, and the user can easily know that transmission to another terminal device is delayed. Further, it is possible to easily know that the operation on the shared data is prohibited or that the operation on the shared data is possible.

[0016] The present invention (claim 6) is a shared screen control method for controlling a user's operation on a shared screen provided in each of a plurality of terminal devices connected via a network. Repeat at the timing
The state of the load on the network is measured, and when the measurement result obtained by the measurement satisfies the first condition, all or all of the operations performed by the user on the data displayed on the shared screen A part is prohibited, and when the measurement result satisfies the second condition, the prohibited operation is enabled again.

Preferably, in prohibiting the operation, the operation set in the operation prohibiting means may be prohibited. Preferably, the determination of the prohibition of the operation and the resumption of the prohibited operation may be performed based on an algorithm set in an algorithm setting unit.

Preferably, the result of measurement by the measuring means may be displayed. Note that the present invention relating to the apparatus is also realized as an invention relating to a method, and the present invention relating to a method is also realized as an invention relating to an apparatus.

The present invention relating to an apparatus or a method is provided for causing a computer to execute a procedure corresponding to the present invention (or for causing a computer to function as means corresponding to the present invention, or for causing a computer to correspond to the present invention). The present invention is also realized as a computer-readable recording medium in which a program for realizing the function of performing the above is recorded.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) An electronic conference system according to a first embodiment of the present invention will be described.

FIG. 1 shows a configuration example of an electronic conference system according to the present embodiment. In this electronic conference system, a plurality of terminals 100 having an electronic conference function are connected via a network 120, and data is exchanged between the terminals 100 to share data. In FIG. 1, two terminals 10 are connected.
Although only 0 is shown, three or more devices may be connected.

As shown in FIG. 1, each terminal 100 in the present electronic conference system has a shared screen 10
1, a measuring unit 102, an operation prohibiting unit 103, and a prohibited operation canceling unit 104.

The shared screen 101 performs processing for sharing data and displays shared data on a display screen. The user makes changes to the shared data through the shared screen 101. When a change is made to the shared data, the shared screen 101 transmits the changed portion or the entire shared data to another terminal 100. The other terminal 100 that has received the changed portion of the shared data or the entire changed shared data updates the shared data of its own terminal,
It is displayed on the shared screen 101.

The network is under heavy load, and cannot transmit a changed portion of the shared data or the entire changed shared data (hereinafter, the changed portion of the shared data or the entire changed shared data is simply referred to as changed data). In such a case, the shared screen 101 retains the data and transmits the data as soon as transmission becomes possible.

The shared screen 101 is the entire display screen of each terminal 100 or one or more windows displayed on the terminal 100. A typical example of the shared screen is a shared white board. The drawing on the shared white board of the user is transmitted to all other terminals and displayed. Each user:
A conference can be held while viewing the same data on the own terminal.

Measurement section 102 calculates the data transmission status of its own terminal. In the present embodiment, it is assumed that the amount of data that the own terminal holds without transmitting is calculated. The amount of data indicates, for example, the number of packets or the size of data.

The operation prohibition unit 103 prohibits all or a part of the user's operation on the shared screen 101 based on the measurement result of the measurement unit 102. The prohibited operation release unit 104 releases the user operation prohibited by the operation prohibition unit 103 based on the measurement result of the measurement unit 102.

Next, a description will be given of a process of operation prohibition and prohibition operation release in the electronic conference system according to the present embodiment. FIG. 2 shows an example of a processing procedure of operation prohibition and prohibition operation release in the electronic conference system.

The electronic conference system repeats the procedure illustrated in FIG. 2 regularly or irregularly. First, the measuring unit 102
Measures the amount of untransmitted data among the data held by the shared screen 101 of the own terminal (step S20).
1). The amount of untransmitted data refers to the number of untransmitted packets, the size of untransmitted data, or both.

Next, the measuring section 102 is operated by the operation prohibiting section 104.
Checks whether the user has prohibited the user from operating the shared screen 101 (step S202). If an operation on the shared screen 101 is prohibited, the measurement unit 102 notifies the measurement result to the prohibited operation release unit 104,
Proceed to step S203.

The prohibited operation release unit 104 determines whether the user operation prohibited by the operation prohibited unit 104 should be enabled again based on the measurement result measured by the measuring unit 102 (step S203).

The prohibited operation release unit 104 is operated by the operation prohibited unit 103
If it is determined that the operation prohibited by the operation is permitted, the operation prohibited by the operation prohibition unit 103 is permitted to operate the shared screen 101 (step S2).
04). On the other hand, the prohibited operation release unit 104 is
If it is determined that the operation prohibited by 3 is not allowed, the process ends without doing anything.

If the operation on the shared screen 101 is not prohibited in step S202, the measuring unit 102 notifies the result of the measurement to the prohibited operation releasing unit 104, and proceeds to step S205.

The operation prohibition unit 103 determines whether or not to prohibit the user from operating the shared screen 101 based on the measurement result measured by the measurement unit 102 (step S20).
5). When the operation prohibition unit 103 determines that the user's operation on the shared screen 101 is prohibited, the user's operation on the shared screen 101 is prohibited (step S2).
06). On the other hand, the operation prohibition unit 103 sets the user's shared screen
If it is determined that the operation for 01 is not prohibited, the process ends without doing anything.

Next, a description will be given of a determination method in which the operation prohibition unit 103 determines that the operation is prohibited and the prohibited operation release unit 104 determines that the operation prohibition is released. An example of the first determination method is
This is a method of setting a certain threshold.

When the measurement result is notified from the measurement unit 102, the operation prohibition unit 103 sets the set threshold value and the measurement unit 1
By comparing the measurement result with the measurement result from No. 02 and determining that the operation is prohibited when the amount of untransmitted data measured by the measurement unit 102 is equal to or larger than the threshold value.

When the measurement result is notified from the measurement unit 102, the prohibited operation release unit 104 compares the set threshold value with the measurement result from the measurement unit 102, and checks the untransmitted data measured by the measurement unit 102. When the amount of data is smaller than the threshold, it is determined that the prohibited operation can be operated.

An example of the second determination method is a method of setting two thresholds, a prohibition threshold for determining prohibition of operation and a release threshold for determining release of operation prohibition. The release threshold is set to a value smaller than the prohibition threshold, preferably a sufficiently small value.

When the measurement result is notified from the measurement unit 102, the operation prohibition unit 103 sets the prohibition threshold value and the measurement unit 102
From the measurement result from the above, if the amount of untransmitted data measured by the measurement unit 102 is equal to or greater than the prohibition threshold,
Prohibit operation.

When the measurement result is notified from the measuring unit 102, the prohibited operation canceling unit 104 sets the canceling threshold and the measuring unit 1
Then, when the amount of untransmitted data measured by the measurement unit 102 is smaller than the release threshold, it is determined that the prohibited operation can be operated.

The first determination method requires only one threshold to be set as compared with the second determination method. However, immediately after the prohibited operation is canceled, the amount of untransmitted data is close to the threshold. In many cases, subsequent operations on the shared data immediately enter the operation prohibited state. Therefore, prohibition
There is a possibility that the release state is frequently repeated.

In the second determination method, even if the amount of untransmitted data immediately after the prohibition is released and then prohibited again is near the release threshold, it is sufficiently smaller than the prohibition threshold. The operation on the shared data does not immediately cause the operation to be prohibited. Therefore, the frequency of repetition of prohibition / release is lower than in the first determination method.

According to the present embodiment, when the network is under heavy load, the user is prohibited from operating the shared screen accompanying communication via the network, and by keeping the amount of unsent change data small, The difference in the display content of the shared screen can be kept small.

(Second Embodiment) Next, an electronic conference system according to a second embodiment of the present invention will be described. In the present embodiment, a function for setting the content of the prohibited operation is added to each terminal of the first embodiment.

FIG. 3 shows a configuration example of the electronic conference system of the present embodiment. In this electronic conference system, a plurality of terminals 300 having an electronic conference function are connected via a network 120, and data is exchanged between the terminals 300 to share data. In FIG. 3, two terminals 30 are connected.
Although only 0 is shown, three or more devices may be connected.

As shown in FIG. 3, each terminal 300 in the present electronic conference system has a shared screen 30
1, a measurement unit 302, an operation prohibition unit 303, a prohibition operation release unit 304, and a prohibition operation setting unit 305.

The shared screen 301, the measuring unit 302, and the prohibited operation releasing unit 304 are the same as the shared screen 101, the measuring unit 102, and the prohibited operation releasing unit 104 in the first embodiment, respectively.

The prohibited operation setting unit 305 is for setting an operation to be prohibited when the network is under heavy load (operations to be prohibited among operations on the shared screen). Notify.

The configuration of the prohibited operation setting unit 305 is, for example, for storing all the operations as candidates for prohibition targets in association with information indicating whether the operation is prohibited or not. It is conceivable that a table is provided so that information indicating whether or not to be prohibited can be set. Alternatively, a method of holding identification information of an operation to be prohibited is also conceivable.

The setting of the operation to be prohibited is performed, for example, based on a user's input at each terminal. More specifically, a method is conceivable in which, for example, a name or a symbol capable of specifying each operation and a check box corresponding thereto are displayed as a setting screen, and the operation corresponding to the check box checked by the user is set to be prohibited. Can be

Alternatively, for example, the setting may be performed by reading a file in which the setting contents of the prohibited operation are described from a management server (any terminal may be also used as the file) via a network. Good. Alternatively, the administrator or the like sets an operation to be prohibited in the management server (any terminal may also serve as this) and distributes a file in which the setting contents are described to each terminal via the network, Each terminal receiving this file may set the setting contents in the prohibited operation setting unit 305.

The setting contents of the operation to be prohibited may be appropriately changed during use of the electronic conference system, or may be set in advance (semi-fixed).

When the above-mentioned setting is individually performed in each terminal, the setting contents do not necessarily have to be the same for all terminals, and a difference may occur in the setting contents for each terminal.
The operation prohibition unit 303 determines whether to prohibit the operation based on the measurement result of the measurement unit 302 as in the first embodiment,
If it is determined that the operation should be prohibited, only the operation set by the prohibited operation setting unit 305 is prohibited.

The processing procedure of the operation prohibition and the prohibition operation release in the electronic conference system according to the present embodiment is basically the same as the processing procedure in the first embodiment illustrated in FIG. Step S in the form
The point that the processing by the operation prohibition unit 303 in 206 is as described above.

As described above, by providing the prohibited operation setting unit 305, the user can prohibit input only of an operation that causes a problem if a difference occurs in shared data, and can freely operate other operations. Detailed settings can be made.

For example, when a document is created jointly using a shared screen, it is necessary to keep the difference in shared data between the terminals for the created document. Regarding the comment to be added, it is not always necessary to keep the difference between the terminals small. In such a case, it is possible to prohibit the user's operation only for a document created when the network is under heavy load, and to add a comment at any time.

(Third Embodiment) Next, an electronic conference system according to a third embodiment of the present invention will be described. In the present embodiment, each terminal of the first embodiment is provided with a function for setting an algorithm for prohibiting operation or canceling the prohibited operation.

FIG. 4 shows a configuration example of the electronic conference system of the present embodiment. In this electronic conference system, a plurality of terminals 400 having an electronic conference function are connected via a network 120, and data is exchanged between the terminals 400 to share data. In FIG. 4, two terminals 40 are connected.
Although only 0 is shown, three or more devices may be connected.

As shown in FIG. 4, each terminal 400 in the present electronic conference system has a shared screen 40
1, a measurement unit 402, an operation prohibition unit 403, a prohibition operation release unit 404, and an algorithm setting unit 405.

The shared screen 401 and the measuring unit 402 are respectively the shared screen 101 and the measuring unit 102 in the first embodiment.
Is the same as The algorithm setting unit 405 is for setting an algorithm used by the operation prohibition unit 403 and the prohibition operation release unit 404 to determine whether to prohibit operation and release operation prohibition, respectively. The algorithm is controlled by the operation prohibition unit 403 or the prohibition operation release unit 40
Give to 4. Note that the algorithm here is, for example, a determination procedure or a determination rule for determining whether or not to prohibit operation, and for determining whether or not to release prohibition.

In the present embodiment, since the control of the operation prohibition is performed based on the algorithm, more detailed control can be performed than in the second embodiment. For example, control such as increasing or decreasing the range of operations to be prohibited according to conditions such as measurement results can be performed. In this case, the above algorithm determines whether or not to prohibit the operation, and when it is determined to perform the operation prohibition, determines the operation to be prohibited, and determines and prohibits whether or not to release the prohibition. It is possible to determine, for example, an operation whose prohibition should be canceled among those whose operations are prohibited when it is determined that the cancellation is performed.

As a description method of this algorithm, for example, various methods such as a description in an if then rule format, a description in a table format, and the like can be considered. The setting of the algorithm is performed, for example, at each terminal based on a user's input. More specifically, for example, a method in which a user directly describes an algorithm on a setting screen or modifies a template, or a method in which a user selects a desired algorithm from a plurality of types of algorithms prepared in advance. Various methods are conceivable.

Alternatively, for example, the setting may be performed by reading a file in which an algorithm is described from a management server (any terminal may be used as the file) via a network. Alternatively, an administrator or the like creates or selects an algorithm in a management server (any terminal may be used as the same), and distributes a file in which the algorithm is described to each terminal via a network. Alternatively, each terminal receiving this file may set the algorithm in the algorithm setting unit 405.

The setting contents of this algorithm may be appropriately changed during use of the electronic conference system.
It may be set in advance (semi-fixed).
When the above-described setting is individually performed in each terminal, the content of the algorithm does not necessarily have to be the same for all terminals, and the content may differ between terminals.

The operation prohibition unit 403 prohibits all or a part of the user's operation on the shared screen based on the measurement result of the measurement unit 402 and the algorithm set by the algorithm setting unit 405.

The prohibited operation release unit 404 releases all or a part of the user operation prohibited by the operation prohibition unit 403 based on the measurement result of the measurement unit 402 and the algorithm set by the algorithm setting unit 405. .

The processing procedure for prohibiting operation and releasing the prohibited operation in the electronic conference system according to the present embodiment is basically the same as the processing procedure in the first embodiment illustrated in FIG. Step S in the form
The point that the processing by the prohibited operation release unit 404 in 203 and the processing by the operation prohibited unit 403 in step S206 are as described above.

Thus, for example, when the user recognizes that there is a difference in the shared data that is difficult to hold an electronic conference, the first operation is performed by using the algorithm setting unit 405 to determine the operation prohibition. By setting the threshold value small in the embodiment, the amount of untransmitted shared data can be kept small, and the difference between shared data can be reduced.

On the other hand, if the set threshold is too small, the operation frequently enters the operation prohibition state and the operation on the shared data becomes inconvenient, the algorithm setting unit sets the threshold for judging the operation prohibition. By setting a large value, the frequency of entering the operation prohibition state can be reduced.

As described above, the size of the difference in the shared data displayed on the shared screen can be adjusted by the user or the like according to the situation, so that the difference in the shared data can be adjusted even when the network environment to be used changes. The size desired by the user can be maintained.

(Fourth Embodiment) Next, an electronic conference system according to a fourth embodiment of the present invention will be described. In the present embodiment, a function of displaying information regarding untransmitted data on each terminal of the first embodiment is added.

FIG. 5 shows a configuration example of the electronic conference system of the present embodiment. In this electronic conference system, a plurality of terminals 500 having an electronic conference function are connected via a network 120, and data is exchanged between the terminals 500 to share data. In FIG. 5, two terminals 50 are used.
Although only 0 is shown, three or more devices may be connected.

As shown in FIG. 5, each terminal 500 in the electronic conference system has a shared screen 50
1, a measuring unit 502, an operation prohibiting unit 503, a prohibited operation canceling unit 504, and a display unit 505.

The shared screen 501, the measuring unit 502, the operation prohibiting unit 503, and the prohibited operation canceling unit 504 are the same as the shared screen 101, the measuring unit 102, the operation prohibiting unit 103, and the prohibited operation canceling unit 104 in the first embodiment, respectively. is there. Also,
The processing procedure of the operation prohibition and the prohibition operation release in the electronic conference system according to the present embodiment is the same as the processing procedure in the first embodiment illustrated in FIG.

In the present embodiment, the display unit 505 displays information on untransmitted data. This information, for example,
The shared data is displayed in a predetermined area of the display screen used for display. The information relating to the untransmitted data is, for example, a threshold value used for determining the prohibition of the operation and / or the release of the prohibited operation (for example, the threshold value in the first determination method of the first embodiment, the threshold value for inhibition in the second determination method, This is a relative value of the untransmitted data with respect to the prohibition threshold).

Thus, the user can grasp the state of the load on the network, and can easily know that the operation on the shared data is prohibited or that the operation on the shared data is possible.

This embodiment can be implemented in combination with the second embodiment or the third embodiment. It is also possible to adopt a network configuration in which terminals according to the different embodiments described above coexist.

The above functions can also be realized as software. Further, the present embodiment is a computer-readable computer that records a program for causing a computer to execute a predetermined procedure (or for causing the computer to function as predetermined means, or for causing the computer to realize a predetermined function). It can also be implemented as a recording medium. The present invention is not limited to the above-described embodiment, and can be implemented with various modifications within the technical scope.

[0079]

According to the present invention (claim 1), when the load on the network is high, the operation of the user on the shared screen accompanying communication via the network is prohibited, so that the display content of the shared screen can be reduced. The difference between the terminals can be kept small.

According to the present invention (claim 2), it is possible to make detailed settings such that only the portions of the shared data displayed on the shared screen of each terminal that need to keep the difference small are kept small. it can.

According to the present invention (claim 3), the size of the difference between the shared data displayed on the shared screen can be adjusted by the user or the like according to the situation. Also, the difference between the shared data can be maintained at a size desired by the user.

According to the present invention (claim 4), the user can grasp the state of the load on the network, and the operation on the shared data can be easily prohibited or the operation on the shared data can be performed. You can know that.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration example of an electronic conference system according to a first embodiment of the present invention;

FIG. 2 is a diagram showing an example of an operation procedure according to the first embodiment of the present invention.

FIG. 3 is a diagram illustrating a configuration example of an electronic conference system according to a second embodiment of the present invention;

FIG. 4 is a diagram showing a configuration example of an electronic conference system according to a third embodiment of the present invention;

FIG. 5 is a diagram illustrating a configuration example of an electronic conference system according to a fourth embodiment of the present invention;

[Explanation of symbols]

 100, 300, 400, 500 terminal 101, 301, 401, 501 shared screen 102, 302, 402, 502 measurement unit 103, 303, 403, 503 operation prohibition unit 104, 304, 404, 504 prohibition operation Release unit 305: Prohibited operation setting unit 405: Algorithm setting unit 505: Display unit

Continuation of front page (72) Inventor Akihiko Sugikawa 8-6-26 Motoyama Minamicho, Higashinada-ku, Kobe-shi, Hyogo Prefecture Toshiba Kansai Research Institute Co., Ltd.

Claims (6)

[Claims] 1. An electronic conference system having a shared screen for displaying shared data to each of a plurality of terminals connected via a network, wherein each of the terminals measures a load status of the network. A measuring unit; an operation prohibiting unit that prohibits all or a part of an operation performed by a user on data displayed on the shared screen based on a measurement result by the measuring unit; and a measurement result by the measuring unit. And a prohibition operation canceling means for making the operation prohibited by the operation prohibiting means operable again based on the electronic conference system. 2. A terminal device having a shared screen for displaying data shared by exchanging data with each of one or more other terminal devices connected via a network, A measuring unit for measuring the load status of the network; and an operation prohibition for prohibiting all or a part of the operation performed by the user on the data displayed on the shared screen based on the measurement result by the measuring unit. And a prohibition operation canceling means for making the operation prohibited by the operation prohibiting means operable again based on a measurement result by the measuring means. 3. The terminal device according to claim 2, further comprising a prohibited operation setting means for setting an operation to be prohibited by said operation prohibiting means. 4. An algorithm for the operation prohibiting means to determine prohibition of the operation based on the measurement result, and for the prohibiting operation release means to determine resumption of the prohibited operation based on the measurement result. 3. The terminal device according to claim 2, further comprising an algorithm setting unit for setting the parameter. 5. The apparatus according to claim 2, further comprising display means for displaying a result of measurement by said measurement means.
A terminal device according to item 1. 6. A shared screen control method for controlling a user's operation on a shared screen provided in each of a plurality of terminal devices connected via a network, wherein the method is repeated at a predetermined timing. The state of the load is measured, and when the measurement result obtained by the measurement satisfies the first condition, all or a part of the operation performed by the user on the data displayed on the shared screen is performed. Prohibiting, and, when the measurement result satisfies a second condition, enabling the prohibited operation again.