JP2009230579A - Screen sharing system, screen sharing method, server terminal control program, client terminal control program and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make an electronic meeting seamless by sharing the same screen in real time. <P>SOLUTION: A server terminal 10 includes an input part 11 capable of drawing input, an image data transmission part 12 for transmitting image data on a capture screen, a whiteboard 14 of transparent background for sharing a drawing screen from the input part 11, a display 16 for displaying the whiteboard 14 over a desktop work screen, and a control part 15 for controlling the server terminal 10. A client terminal 20 includes an input part 21 capable of drawing input, an image data reception part 22 for receiving the capture screen image data, a whiteboard 24 of transparent background for sharing a drawing screen from the input part 21, a display 26 for displaying the received image data as a shared screen and displaying the whiteboard 24 thereover, and a control part 25 for controlling the client terminal 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a screen sharing system, a screen sharing method, and a server terminal control program in which one server terminal having a display and at least one client terminal having a display are connected via a network and share the screen of each display. The present invention relates to a client terminal control program and a recording medium.

  As a system suitable for conducting electronic conferences etc. by connecting terminals at remote sites via a network, the screens of terminals at other sites can be displayed and operated at hand, or conversely There is a screen sharing system that displays on the screen of a terminal at another site.

  As a screen sharing system in the prior art, for example, there is a conference support system disclosed in Patent Document 1. FIG. 1 is a diagram illustrating a conventional conference support system. In FIG. 1, the conference support system has one server and two clients A and B.

  The server PC 100 has a desktop screen 50 on the bottom surface, and an application can be executed on the desktop screen 50 to open a document. On the desktop screen 50, there is a window 54 in which the windows 51 to 52 of each client and the window 53 of the server are superimposed and displayed with a transparent background.

  The client PC 200 has a shared screen 60 with the window 54 of the server PC 100 on the bottom surface, and in the upper layer of the shared screen, a local window 61 in which each client writes, a local window 61 and a shared screen 60 There is a window 62 in which is superimposed and displayed.

  Here, the background can be made transparent and superimposed, for example, by using Windows (registered trademark) 2000 or higher OS of Microsoft Corporation by using a window style called Layered Window.

  On the screen of the server PC 100, the window 54 in which the whiteboard writing is superimposed on the screen of the application running on the desktop screen 50 and displayed in a superimposed manner is shared with each client PC 200 by the screen sharing function.

Japanese Patent Laying-Open No. 2006-31359 (pages 17-18, FIG. 20)

  However, in the conventional screen sharing system as shown in FIG. 1, when the drawing image written on the whiteboard is erased with an eraser tool or the like, the local drawing is immediately erased in the erased user's client PC. The shared screen is not reflected in real time, and the user of each client recognizes that it is still being drawn.

The user recognizes that the erased information of the local drawing is reflected on the whiteboard on the server side, distributed as a shared screen, and disappears only when it is reflected in the lower layer drawing. In FIG. 1, the time taken for the content of the pen drawn on client A to reach client B is
Δta-s: Pen drawing data transfer time from client A to server Δtswb: Time reflected on server whiteboard Δtscap: Time when shared screen is created at server Δtspre: Server transmits shared screen over network Preparation process Δts-b: Transfer time when the shared image is sent from the server to client B Δtcdrw: Time when the client B develops and draws the shared image
ΔT = Δta-s + Δtswb + Δtscap + Δtspre + Δts-b + Δtcdrw (1)
Therefore, since it passes through the network twice or is transferred as image data with a large amount of data, it greatly depends on the network bandwidth.

  Therefore, the response until it is reflected in the lower layer drawing can be processed at high speed when the bandwidth of the network is wide, so there is a possibility that it does not feel uncomfortable. The eraser tool may be perceived as having poor response.

  Problems to be solved by the present invention include a screen sharing system, a screen sharing method, a server terminal control program, a client terminal control program, and a screen sharing system that can share the same screen in real time and can use electronic conferences seamlessly One example is to provide a recording medium.

The screen sharing system according to claim 1 is a screen sharing system in which one server terminal having a display and at least one client terminal having a display are connected via a network to share the screen of each display. And
The server terminal is
An input unit capable of drawing input by an input means;
An image data transmission unit that repeatedly captures only the work screen of the desktop and transmits the image data of the capture screen to another terminal;
A whiteboard with a transparent background for sharing the screen drawn by the input from the input unit with other terminals,
A display that displays the whiteboard on top of the desktop work screen;
A control unit for controlling the server terminal,
The client terminal is
An input unit capable of drawing input by an input means;
An image data receiving unit for receiving image data of a capture screen transmitted from the server terminal;
A whiteboard with a transparent background for sharing the screen drawn by the input from the input unit with other terminals,
A display for displaying the image data received by the image data receiving unit as a shared screen, and further displaying the whiteboard superimposed on the upper layer;
And a control unit for controlling the client terminal.

The screen sharing method according to claim 5 is a screen sharing method in which one server terminal having a display and at least one client terminal having a display are connected via a network and the screen of each display is shared. And
Setting a predetermined terminal of the server terminal and the client terminal to a pen drawing mode;
Detecting pen drawing of the predetermined terminal;
If pen drawing is detected, obtaining pen data information drawn by the pen drawing; and
Drawing on a transparent whiteboard the background of the predetermined terminal;
Transmitting the pen data information to another terminal;
The other terminal displays the received pen data information as a pen drawing on a whiteboard with a transparent background provided in the other terminal; and
To share the whiteboard images of all devices,
Repeatedly capturing only the work screen of the server terminal desktop;
Transmitting the capture screen as image data to the client terminal;
Receiving the image data by the client terminal;
The client terminal displaying the received image data on a shared screen;
The whiteboard is displayed on the upper layer of the desktop work screen on the display of the server terminal, and the image data receiving unit is displayed on the upper layer of the desktop work screen on the display of the client terminal. The received image data is displayed as a shared screen, and the whiteboard is displayed on the upper layer.

The server terminal control program according to claim 6, wherein the server in a system in which one server terminal having a display and at least one client terminal having a display are connected via a network and the screen of each display is shared. On the terminal computer,
Setting the server terminal to pen drawing mode;
Detecting pen drawing of the server terminal;
If pen drawing is detected, obtaining pen data information drawn by the pen drawing; and
Drawing the pen data information on a whiteboard with a transparent background provided in the server terminal;
Transmitting the pen data information to the client terminal;
Capturing only the work screen of the server terminal desktop;
Transmitting a capture screen as image data to the client terminal;
Is executed.

The client terminal control program according to claim 7, wherein the client in a system in which one server terminal having a display and at least one client terminal having a display are connected via a network and share a screen of each display. On the terminal computer,
Setting the client terminal to pen drawing mode;
Detecting pen drawing of the client terminal;
If pen drawing is detected, obtaining pen data information drawn by the pen drawing; and
Drawing the pen data information on a whiteboard with a transparent background of the client terminal;
Transmitting the pen data information to the server terminal and other client terminals;
Receiving the image data;
Displaying the received image data as a shared screen;
Is executed.

  Hereinafter, embodiments of a screen sharing system according to the present invention will be described in detail with reference to the drawings. FIG. 2 is a schematic configuration diagram showing a screen sharing system showing an example of an embodiment according to the present invention.

  As shown in FIG. 2, in the screen sharing system 1 according to the present embodiment, one server terminal 10 is configured by at least one client terminal 20 via a network 2. Although not shown, a system in which a plurality of client terminals are connected may be used.

  The server terminal 10 mainly shares the screen drawn by the user with the input unit 11 capable of drawing input by an input means (such as an electronic pen or a mouse), the image data transmitting unit 12 for transmitting the image data of the capture screen, and the like. And a whiteboard communication unit 14a capable of bidirectional communication, a control unit 15 that controls the server terminal 10, a display 16 that displays images, and a storage unit 17 that stores image data and the like. Furthermore, an image data receiving unit 13 may be provided. An input setting switching unit 19 may be provided.

  The client terminal 20 mainly shares the screen drawn by the user with the input unit 21 capable of drawing input by an input means (such as an electronic pen or a mouse), the image data receiving unit 22 for receiving the image data of the capture screen. And a whiteboard communication unit 24a capable of bidirectional communication, a control unit 25 that controls the client terminal 20, a display 26 that displays an image, and a storage unit 27 that stores image data and the like. Further, an image data transmission unit 23 may be provided. Further, an input setting switching unit 29 may be provided.

  Furthermore, the screen display of the screen sharing system according to the present embodiment will be described in detail with reference to FIG. FIG. 3 is an explanatory diagram regarding screen display on the display of the screen sharing system according to the present embodiment.

  As shown in FIG. 3, the whiteboard 14 of the server terminal 10 and the whiteboard 24 of the client terminal 20 are shared by both terminals. That is, the bidirectional communication is always performed between the whiteboard communication units 14a and 24a via the network 2 to share data.

  Since the communication between the whiteboard communication units 14a and 24a is only communication of pen data information (information such as pen operation position, locus, line thickness, line type, and color), one of the whiteboards 14 (or The drawing result of the electronic pen (or mouse or the like) for 24) is transmitted to the other whiteboard 24 (or 14) as immediate pen data information, and the drawing result is immediately reflected.

  The above whiteboards 14 and 24 are whiteboards with a transparent background (for example, if Windows (registered trademark) 2000 or later of Microsoft Corporation is used, the whiteboard background color is set to a transparent color in a layered window). Can be realized). Thus, a whiteboard with a transparent background is mounted on a normal PC (personal computer) or the like if it has the characteristics of “transparent background” and “layered window style”. This can be realized by using the whiteboard function.

  In addition, the server terminal 10 captures only the desktop work screen 16b (the screen on which the application is activated and works) without capturing the whiteboard 14, and acquires the capture screen 18. Then, the image data of the capture screen 18 is transmitted to the client terminal 20 and displayed as a shared screen 28 on the upper layer of the desktop work screen 26b. Since the shared screen 28 is completely different from the whiteboards 14 and 24, the contents of pen drawing are not reflected on the shared screen 28.

  Therefore, as shown in FIG. 3, the display 16 of the server terminal 10 has a screen display 16a in which the whiteboard 14 with a transparent background is superimposed on the upper layer of the desktop work screen 16b. The display 26a of the client terminal 20 has a screen display 16a in which the capture screen 18 is superimposed on the upper layer of the desktop work screen 26b and the whiteboard 24 with a transparent background is further superimposed on the upper layer.

An example of the screen sharing method according to the present embodiment will be described with reference to FIGS. 4 and 5 are flowcharts showing an example of the screen sharing method according to the present embodiment.
As shown in FIG. 4, first, in the server terminal 10, the pen drawing mode is set under the control of the control unit 15 (step S1).

  As a result, the user can input from the input unit 11, and the control unit 15 detects pen drawing in the input unit 11 (electronic pen, mouse, etc.) (step S2).

  When pen drawing is detected (step S2: YES), the control unit 15 acquires the drawn pen data information (information such as pen operation position, trajectory, line thickness, line type, color, and the like) ( Step S3). If the input unit 11 (electronic pen, mouse, etc.) is used as an eraser tool for erasing an already drawn image, pen data information as erasure information is acquired.

  The acquired pen data information (drawing or erasing) is stored in the storage unit 17 and displayed as an image on the whiteboard 14 (step S4). As a result, as shown in FIG. 3, the display 16 of the server terminal 10 has a screen display 16a in which the desktop work screen 16b and the whiteboard 14 with a transparent background are superimposed.

  The acquired pen data information (drawing or erasing) is transmitted from the communication unit 14a of the whiteboard 14 to the whiteboard communication unit 24a of the client terminal 20 (step S5).

  The received pen data information is stored in the storage unit 27, converted into a pen drawing image under the control of the control unit 25, and the pen drawing drawn on the server terminal 10 is displayed on the whiteboard 24 (step S6).

  Further, pen drawing from the client terminal 20 is also transmitted and displayed on the whiteboard 14 of the server terminal 10 in the same procedure as the flow of steps S1 to S6. In this way, drawing data can be shared between the whiteboard 14 and the whiteboard 24.

As shown in FIG. 5, the control unit 15 of the server terminal 10 captures only the desktop work screen 16b of the server terminal 10 at predetermined time intervals (step S11). The capture screen 18 is transmitted as image data from the image data transmission unit 12 (step S12). Note that not all screen capture data is sent, but only the difference (change area) from the previous captured image may be sent.
The client terminal 20 receives this image data at the image data receiving unit 22 (step S13). The received image data is displayed on the shared screen 28 under the control of the control unit 25 (step S14).

  If the desktop work screen 16b of the server terminal 10 is a moving image, the moving of the moving image displayed on the shared screen 28 of the client terminal 20 can be made smooth by setting the predetermined time short. .

  As described above, the flow of FIG. 4 (steps S1 to S6) and the flow of FIG. 5 (steps S11 to S14) are executed independently, and the display 26 of the client terminal 20 is shared on the upper layer of the desktop work screen 26b. A screen display 26a is formed by superimposing the screen 28 and further overlaying the white board 24 with a transparent background on the upper layer.

  Also, the whiteboards 14 and 24 described above are provided with an input setting switching unit 19 (29) for switching between these settings by setting the pen drawing mode and the mouse mode as follows (indicated by a dotted line in FIG. 2). Can also be shown).

Hereinafter, in the screen sharing system according to the present embodiment, a modified example in which the pen drawing mode and the mouse mode are set on the whiteboard will be described.
FIG. 6 is an explanatory diagram of operations in the pen drawing mode and the mouse mode. FIG. 7 is a screen sharing system according to the present embodiment. The white board on the server terminal side is set to the mouse mode, and the white board on the client terminal side is the pen. It is explanatory drawing when it is set as drawing mode.

As shown in FIG. 6A, when the pen drawing mode is set by the input setting switching unit 19 (29), a normal window style that does not allow the mouse operation (mouse event) to pass is obtained, and the whiteboard 14 (24) is displayed. Only the mouse can be operated, and the mouse cannot be operated on the work screen 16b (26b) of the lower desktop.
In Windows (registered trademark), various window styles related to visual styles are set for a window to be displayed. FIG. 6A shows only the window style that is particularly applied for this function. For example, in the case of Microsoft Windows (registered trademark) 2000 or later, the background color of the whiteboard (the color of the whiteboard itself) is set to a color that is not used for pen drawing, and the background color is specified and WS_EX_LAYERED By applying, the part other than the pen drawing, that is, the background becomes transparent.

Further, as shown in FIG. 6B, when the mouse mode is set by the input setting switching unit 19 (29), the window setting for passing the mouse operation is set, and the lower desktop is passed through the whiteboard 14 (24). The mouse can be operated only on the work screen 16b (26b).
In Windows (registered trademark), various window styles related to visual styles are set for a window to be displayed. FIG. 6B shows only the window style that is particularly applied for this function. For example, in the case of Windows (registered trademark) 2000 or later of Microsoft Corporation, the background is made transparent and the mouse event is passed by combining the window styles WS_EX_LAYERED and WS_EX_TRANSPARENT.

  Accordingly, as shown in FIG. 7, the server terminal 10 side is set to the mouse mode and the client terminal 20 side is set to the pen drawing mode, so that the screen providing side (server terminal 10 side) While operating the window to be displayed on the client terminal 20, the user on the receiving side (client terminal 20 side) can instruct mistakes and requests by pen writing without disturbing the operation on the server terminal 10 side. . That is, it is possible to continue the discussion without interrupting the conference flow.

  Further, while confirming the contents instructed from the client terminal 20 side, the user on the server terminal 10 side can perform the operation as instructed. For example, if an instruction such as “This is enlarged and arranged on this side, and other layouts are done like this” is performed with the electronic pen, the instruction content of the electronic pen is left and the lower layer is left. Thus, window operations can be performed while viewing the instructions.

  In the above-described embodiment, as indicated by the dotted line in FIG. 2, the server terminal 10 includes the image data receiving unit 13 and the client terminal 20 includes the image data transmitting unit 23, so that the terminal is a server. It can be set by switching whether to be a client. For example, by providing a terminal with a server terminal control program and a client terminal control program, and switching the programs, the terminal can function as the server terminal 10 or the client terminal 20.

Further, even when a presentation is unilaterally performed from the server terminal 10 side, an upper layer whiteboard is used to point to a desired position on the application screen while moving an application (animation or video) on the work screen 16b on the server terminal 10 side. It is also possible to perform an effective presentation such as marking or pen drawing on 14, or moving the application on the lower work screen 16b with the mark or pen drawing remaining.
Further, in FIG. 3, the present invention can also be applied to a remote control (remote operation) system in which the mouse information of the client terminal 20 is acquired on the shared screen 28 of the client terminal 20 and the mouse operation is performed on the server 10 side. is there.

  As described above in detail, in the screen sharing system according to the present embodiment, one server terminal 10 having the display 16 and at least one client terminal 20 having the display 26 are connected via the network 2. The screen sharing system 1 shares the screen of each display 16 (26), and the server terminal 10 repeatedly captures only the input unit 11 capable of drawing input by the input means and the desktop work screen 16b, and the capture screen The image data transmitting unit 12 that transmits 18 image data to another terminal, the whiteboard 14 that shares the screen drawn by the input from the input unit 11 with other terminals, and the desktop work screen 16b. A display 16 for displaying the whiteboard 14 on the upper layer, and the server terminal 1 The client terminal 20 includes an input unit 21 that can perform drawing input by an input unit, and an image data receiving unit 22 that receives image data of the capture screen 18 transmitted from the server terminal 10. And a whiteboard 24 with a transparent background for sharing the screen drawn by the input from the input unit 21 with other terminals, and the image data received by the image data receiving unit 22 as a shared screen 28, and further And a display 26 that displays the whiteboard 24 in an overlapping manner, and a control unit 26 that controls the client terminal 20.

  Further, in the screen sharing method according to the present embodiment, one server terminal 10 having the display 16 and at least one client terminal 20 having the display 26 are connected via the network 2, and each display 16 (26 ), A step S1 for setting a predetermined terminal of the server terminal 10 and the client terminal 20 to the pen drawing mode, a step S2 for detecting pen drawing of the predetermined terminal, When pen drawing is detected, step S3 for obtaining pen data information drawn by the pen drawing, step S4 for drawing on a whiteboard 14 (24) with a transparent background provided in a predetermined terminal, and pen data information Is transmitted to the other terminal, and the other terminal draws the received pen data information by pen drawing. And the step S6 for displaying the background of the other terminals on the transparent whiteboard 24 (14), thereby sharing the images of the whiteboards of all the terminals, and the desktop operation of the server terminal 10 Step S11 in which only the screen 16b is repeatedly captured, step S12 in which the capture screen 18 is transmitted as image data to the client terminal 20, a step in which the client terminal 20 receives the image data, S13, and the client terminal 20 receives the received image data. Step S14 to be displayed on the shared screen 28, the whiteboard 14 is displayed on the upper layer of the desktop work screen 16b on the display 16 of the server terminal, and the desktop work is displayed on the display 26 of the client terminal 20. On screen 26b The layer to display image data by the image data receiving section 22 receives as a shared screen 28, displays further superimposed whiteboard 24 thereon.

In addition, the server terminal control program according to the present embodiment is configured such that one server terminal 10 having a display 16 and at least one client terminal 20 having a display 26 are connected via the network 2 and the screen of each display. In the system of the server terminal 10 in the system sharing the information, the step S1 for setting the server terminal 10 to the pen drawing mode, the step S2 for detecting the pen drawing of the server terminal 10, and the pen drawing when the pen drawing is detected. Step S3 for acquiring the pen data information drawn by step S4, Step S4 for drawing the pen data information on the whiteboard 14 with a transparent background included in the server terminal 10, and Step S5 for sending the pen data information to the client terminal 20 And the desktop of the server terminal 10 A step S11 of performing capture work screen 16b only, and the step S12 of transmitting the captured screen 18 as the image data to the client terminal 20, thereby executing.
Further, the client terminal control program according to the present embodiment is configured such that one server terminal 10 having a display 16 and at least one client terminal 20 having a display 26 are connected via the network 2 and the screen of each display. In step S1, the client terminal 20 is set to the pen drawing mode in the computer of the client terminal 20 in the system sharing the information, the step S2 of detecting the pen drawing of the client terminal 20, and the pen drawing when the pen drawing is detected. Step S3 for acquiring pen data information drawn by step S4, Step S4 for drawing pen data information on a whiteboard 24 with a transparent background provided in the client terminal 20, and pen data information for the server terminal 10 and other client terminals 20 A step S5 of trust, a step S13 for receiving image data, a step S14 of displaying the image data received as a shared screen 28, is executed.

As described above, according to the present embodiment, it is possible to perform pen drawing even for moving objects such as moving images and animations. Further, even when the operation is being performed on the server terminal 10 side, an instruction can be given by pen input from the client terminal 20 side without interrupting the operation.
In addition, when a meeting is performed using the screen sharing system 1, it is possible to discuss without interrupting the flow of the meeting. Furthermore, it is possible to avoid interruption of consciousness at points other than the discussion, which is the original purpose of the conference.
It is also possible to discuss the time axis direction using content such as videos and animations. That is, instead of pen-recording a still image, pen writing can be performed on a moving object, so that it is possible to have a discussion that captures the time axis rather than a temporary screen.
Therefore, a real-time instruction is possible. Since pen information is not browsed by screen sharing but based on the whiteboard function, pen drawing with good response is possible for terminals at each base. For example, if drawing is performed while saying “here”, the voice and pen drawing arrive at the terminal at another base at a timing with almost no deviation, so that misrecognition and stress on the recipient can be reduced.
In addition, while operating the desktop on the server terminal side, it is possible to mark or instruct the wrong place or pointed out place on the client terminal side. That is, the pen drawing does not disturb the input operation on the server side.

It is a figure which shows the meeting support system of a prior art. It is a schematic block diagram which shows the screen sharing system which shows an example of embodiment which concerns on this invention. It is explanatory drawing regarding the screen display of the display of the screen sharing system which concerns on this Embodiment. It is a flowchart which shows an example of the screen sharing method which concerns on this Embodiment. It is a flowchart which shows an example of the screen sharing method which concerns on this Embodiment. It is explanatory drawing of operation | movement of pen drawing mode and mouse mode. In the screen sharing system according to the present embodiment, the whiteboard on the server terminal side is set to the mouse mode, and the whiteboard on the client terminal side is set to the pen drawing mode.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Screen sharing system 2 Network 10 Server terminal 20 Client terminal 11,21 Input part 12,22 Image data transmission part 13,23 Image data reception part 14,24 Whiteboard 14,24a Whiteboard communication part 15,25 Control part 16 ( Server terminal) display 26 (client terminal) display 16a, 26a (display) screen display 16b, 26b (desktop) work screen 17, 27 storage unit 18 capture screen 28 shared screen

Claims (8)

A screen sharing system in which one server terminal having a display and at least one client terminal having a display are connected via a network and share a screen of each display,
The server terminal is
An input unit capable of drawing input by an input means;
An image data transmission unit that repeatedly captures only the work screen of the desktop and transmits the image data of the capture screen to another terminal;
A whiteboard with a transparent background for sharing the screen drawn by the input from the input unit with other terminals,
A display that displays the whiteboard on top of the desktop work screen;
A control unit for controlling the server terminal,
The client terminal is
An input unit capable of drawing input by an input means;
An image data receiving unit for receiving image data of a capture screen transmitted from the server terminal;
A whiteboard with a transparent background for sharing the screen drawn by the input from the input unit with other terminals,
A display for displaying the image data received by the image data receiving unit as a shared screen, and further displaying the whiteboard superimposed on the upper layer;
And a control unit that controls the client terminal.   The screen sharing system according to claim 1, wherein the control unit of the server terminal captures only the desktop work screen of the server terminal at predetermined time intervals.   The screen sharing system according to claim 1, wherein the input unit is an electronic pen or a mouse. For the whiteboard,
The screen sharing system according to claim 3, further comprising: an input setting switching unit that switches between a pen drawing mode for setting a window that does not allow a mouse operation to pass and a mouse mode for setting a window that allows a mouse operation to pass. A screen sharing method in which one server terminal having a display and at least one client terminal having a display are connected via a network to share a screen of each display,
Setting a predetermined terminal of the server terminal and the client terminal to a pen drawing mode;
Detecting pen drawing of the predetermined terminal;
If pen drawing is detected, obtaining pen data information drawn by the pen drawing; and
Drawing on a transparent whiteboard the background of the predetermined terminal;
Transmitting the pen data information to another terminal;
The other terminal displays the received pen data information as a pen drawing on a whiteboard with a transparent background provided in the other terminal; and
To share the whiteboard images of all devices,
Repeatedly capturing only the work screen of the server terminal desktop;
Transmitting the capture screen as image data to the client terminal;
Receiving the image data by the client terminal;
The client terminal displaying the received image data on a shared screen;
The whiteboard is displayed on the upper layer of the desktop work screen on the display of the server terminal, and the image data receiving unit is displayed on the upper layer of the desktop work screen on the display of the client terminal. A screen sharing method characterized in that the received image data is displayed as a shared screen, and the whiteboard is superimposed on the upper layer. One server terminal having a display and at least one client terminal having a display are connected via a network, and the computer of the server terminal in a system sharing the screen of each display,
Setting the server terminal to pen drawing mode;
Detecting pen drawing of the server terminal;
If pen drawing is detected, obtaining pen data information drawn by the pen drawing; and
Drawing the pen data information on a whiteboard with a transparent background provided in the server terminal;
Transmitting the pen data information to the client terminal;
Capturing only the work screen of the server terminal desktop;
Transmitting a capture screen as image data to the client terminal;
The server terminal control program characterized by performing. One server terminal having a display and at least one client terminal having a display are connected via a network, and a computer of the client terminal in a system sharing a screen of each display,
Setting the client terminal to pen drawing mode;
Detecting pen drawing of the client terminal;
If pen drawing is detected, obtaining pen data information drawn by the pen drawing; and
Drawing the pen data information on a whiteboard with a transparent background of the client terminal;
Transmitting the pen data information to the server terminal and other client terminals;
Receiving the image data;
Displaying the received image data as a shared screen;
A client terminal control program characterized by causing   8. A recording medium on which the program of claim 6 and / or 7 is recorded.

Images