JP2020046772A - Drawing system, server, and method of transmitting drawing instruction information - Google Patents

Abstract

To provide: a drawing system which is small in consumption of a power supply battery, and can greatly suppress traffic in transmission and reception and also has a high degree of freedom of system construction while maintaining resolution of a drawing terminal; a server; and a method of transmitting drawing instruction information.SOLUTION: A drawing system comprises a server S configured to communicate with a plurality of drawing terminals T1-Tn, the server being configured to: receive drawing instruction information, including drawing loci and attribute information on the drawing loci, to touch panels of the plurality of drawing terminals T1-Tn; and generate, based upon the received drawing instruction information, a display image displaying a list of the drawing loci on the plurality of drawing terminals T1-Tn.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a drawing system, a drawing terminal, a server, and a method of transmitting drawing command information suitable for transferring drawing command information in real time.

  A system for collecting and displaying information from a plurality of terminals has been developed. For example, Japanese Patent Application Laid-Open No. 2002-149615 discloses an electronic blackboard functioning as a common screen with a plurality of terminal devices, and a communication device that performs input and display control in electronic countries and transmission / reception control with each communication terminal. A conference system provided with the system is disclosed (Patent Document 1). Japanese Patent Application Laid-Open No. 2015-95018 discloses an electronic pen, an answer sheet, a student terminal, a lecturer terminal used by a lecturer, and a wireless LAN router connected between the student terminal and the lecturer terminal. There is disclosed a display system that includes a transfer device such as, and displays the handwriting written by the student on the answer sheet with the electronic pen once on the student terminal, and then aggregates the data indicating the handwriting on the instructor terminal. (Patent Document 2).

  At a site where a quiz program or variety program is recorded in a studio, a scanner system or a system for transmitting a video signal from a tablet terminal is used as a display system for collectively displaying answers handwritten by a plurality of guest respondents. In the scanner method, the contents written by the respondent on the flip are converted into data by a scanner to create a multi-screen. In the method of transmitting a video signal from a tablet terminal, video signals (HDMI (registered trademark), VGA) from each tablet terminal are collected in a management terminal and displayed on a multi-screen by a screen divider.

JP-A-2002-149615 JP 2015-95018 A

  However, in the scanner method, not only does it take a long time to take in data, but also it is not possible to observe the progress in real time, so that it is not possible to rank answers in quick answer or the like.

  In the method of transmitting a video signal from a tablet terminal, a video signal having a large data size is used. Therefore, it is necessary to individually wire a cable for capturing video signals from all tablet terminals to each tablet terminal. For this reason, there has been a defect that the wiring work at the studio site is complicated, and the connection is hardly provided with a degree of freedom for movement such as holding or leaning by hand.

  A method of transmitting an image of a tablet terminal using a wired LAN (Local Area Network) represented by Ethernet (registered trademark) is also conceivable. However, since the tablet terminal also requires wiring, the problem of the tablet method still remains.

  If a wireless LAN represented by Wi-Fi (registered trademark) is used, the problem of wiring the tablet terminal can be solved. However, if an image signal of the tablet terminal is transferred, a large amount of data transmission is required. The power consumption of the battery of the terminal is severe, and it is difficult to keep the battery until the end of program recording.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a drawing technique which can reduce the power consumption of a power supply battery, greatly reduce transmission / reception traffic, and has a high degree of freedom for movement in order to overcome the above problems.

  The present embodiment is a drawing system comprising: a plurality of drawing terminals that transmit drawing command information input from a touch panel superimposed on a display unit; and a server that receives the drawing command information and generates a display image. The drawing command information is drawing command information including a drawing trajectory on the touch panel and attribute information for the drawing trajectory, and the server determines the plurality of drawing commands based on the drawing command information from the plurality of drawing terminals. This is for generating a display image for displaying a list of drawing loci in the drawing terminal.

  According to the present embodiment, the drawing command information can be displayed as a list not as information having a large data size such as an image and a video signal but as drawing command information including trajectory information and attribute information whose data size is extremely small. It is possible to provide a drawing technique that can significantly reduce traffic in transmission and reception, consumes less battery, and has a high degree of freedom for movement in a drawing terminal.

FIG. 1 is a block diagram of a drawing system according to the embodiment. FIG. 2 is a block diagram of the drawing terminal. FIG. 3 is a block diagram of the communication device. FIG. 4 is a block diagram of the server. FIG. 5 is an explanatory diagram of an information communication mode between the drawing terminal and the server. FIG. 6 is an explanatory diagram of a display screen example of the drawing terminal. FIG. 7 is an explanatory diagram of a display screen example of the server. FIG. 8 is an explanatory diagram of the drawing area of the server. FIG. 9 is an explanatory diagram of an operation image when all drawing terminals are present in the same segment. FIG. 10 is an explanatory diagram of an operation image when some drawing terminals exist in another segment. FIG. 11 is an explanatory diagram of an operation image in the case where some drawing terminals exist outside (such as a relay site). FIG. 12 is an explanatory diagram of an operation image in a case where all drawing terminals exist outside (a relay site or the like). FIG. 13 is an explanatory diagram showing a display example on the server S side when operating at an art event or the like.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
<Drawing system>
FIG. 1 shows a basic configuration example of the drawing system 1. As shown in FIG. 1, the drawing system 1 includes a plurality of drawing terminals T1 to Tn, a communication device AP, and a server S, and is connected to each other by a network such as a wireless LAN.

  From each of the drawing terminals T1 to Tn, drawing command information d1 to dn corresponding to the input image is output by radio waves. The drawing command information d1 to dn are transmitted to the server S via the communication device AP.

  The control information D1 to Dn is output from the server S by radio waves. The control information D1 to Dn are distributed to each of the drawing terminals T1 to Tn via the communication device AP.

  The drawing system 1 is installed in a studio of a television station, for example. However, there are various modes of operation, and other modes will be described later.

<Drawing terminals T1 to Tn>
FIG. 2 shows a configuration example of the drawing terminal T1. For simplicity of description, the drawing terminal T1 will be described as an example, but the same applies to the other drawing terminals T2 to Tn, and illustration and description thereof are omitted.

  As shown in FIG. 2, the drawing terminal T1 includes a control unit 3, a display unit 4, a communication unit 5, and a non-volatile memory 6 as basic components, which are connected to the bus 2.

  Although not shown, the control unit 3 includes a CPU (Central Processing Unit), a ROM (Read-Only Memory), and a RAM (Random Access Memory), reads a control program stored in the ROM, expands the control program in the RAM, and executes the program. Necessary information is stored in the nonvolatile memory 6. In this specification, the nonvolatile memory includes a flash memory, a static RAM, a hard disk, a disk memory, and the like. Drawing software is stored in the non-volatile memory 6, and pen / brush information included in the drawing software is used for drawing command information d1 to dn. Details of the drawing command information d1 to dn will be described later.

  The display unit 4 uses a display device such as a liquid crystal or an organic EL, and has a touch panel (not shown) superimposed on the display surface. The touch panel may be a resistive type or a capacitive type. The touch panel detects a trajectory of a pen or a finger (such as a pen) and generates trajectory information. Specifically, the touch panel detects whether or not the pen or the like is pressed at a sampling timing (for example, every several hundred milliseconds), and when it detects that the pen or the like is pressed, the touched position is represented by coordinate information. Output as The touch panel is capable of designating how to decorate the drawing locus, and generates attribute information indicating the designated form. The attribute information is output as drawing command information together with the trajectory information.

  The communication unit 5 converts the drawing command information into a radio signal, and outputs it as drawing command information d1 to dn from the antenna ANT. The communication unit 5 converts the received control information D1 to Dn from the server S into data, and transmits the data to the control unit 3. The control unit 3 decodes the control information D1 to Dn and performs necessary control.

  As the drawing terminal T1, a personal computer, a tablet, a smartphone, or the like capable of handwriting input can be widely used.

<Communication device AP>
FIG. 3 shows a configuration example of the communication device AP. As shown in FIG. 3, the communication device AP includes, as basic components, a control unit 12, a communication unit 13, and a nonvolatile memory 15, which are connected to a bus 14.

  Although not shown, the control unit 12 includes a CPU, a ROM, and a RAM, reads a control program stored in the ROM, expands the control program in the RAM, and executes the program.

  The communication unit 13 functions as a wireless LAN access point. The communication unit 13 transfers the drawing command information d1 to dn to the server S, and transfers the control information D1 to Dn to the drawing terminals T1 to Tn.

<Server S>
FIG. 4 shows a configuration example of the server S. As shown in FIG. 4, the server S includes a control unit 8, a display unit 9, a communication unit 10, and a non-volatile memory 11 as basic components, which are connected to a bus 7. In particular, the server S in the present embodiment is a server configured to be able to communicate with the plurality of drawing terminals T1 to Tn, and stores drawing loci on the touch panel of the plurality of drawing terminals T1 to Tn and attribute information for the drawing loci. It is configured to receive drawing command information including the drawing command information and to generate a display image that displays a list of drawing trajectories in the plurality of drawing terminals T1 to Tn based on the received drawing command information.

  Although not shown, the control unit 12 includes a CPU, a ROM, and a RAM, reads a control program stored in the ROM, expands the control program in the RAM, and executes the control program. Necessary information is stored in the nonvolatile memory 11.

The display unit 4 uses a display device such as a liquid crystal or an organic EL, and has a touch panel superposed on a display surface. The touch panel may be a resistive type or a capacitive type.

  The communication unit 10 converts the trajectory information / instruction command information written on the touch panel into a radio signal, and outputs the radio signal as control information D1 to Dn from the antenna ANT. Further, the communication unit 10 converts the received drawing command information d1 to dn from the drawing terminals T1 to Tn into data, and transmits the data to the control unit 12. The control unit 12 decodes the drawing command information d1 to dn and performs necessary control.

<Drawing instruction information d1 to dn, control information D1 to Dn>
Next, the drawing command information d1 to dn and the control information D1 to Dn will be described with reference to FIG. FIG. 5 and the following disclose a content list of the drawing command information d1 to dn. (Drawing instruction information)

  The drawing command information has trajectory information indicating the drawing trajectory itself and attribute information indicating decoration and the like for the drawing trajectory.

  (A) Trajectory information: information representing a drawn locus. For example, coordinate information (for example, x, y, z) acquired at each predetermined sampling timing

  The trajectory information is generated by inputting a trajectory to the touch panel in the drawing terminal T1. When inputting a trajectory in the drawing terminal T1, the user uses a pen or a finger. The touch panel detects whether a pen or the like is pressed at a sampling timing (for example, every several hundred milliseconds). When detecting that a pen or the like is pressed, the touch panel outputs the pressed position as coordinate information. Time information may be added to the coordinate information.

  On the server S side that receives the trajectory information, if the drawing is performed so as to connect the positions specified by the coordinate information in the order in which the trajectory information is received, the handwriting as described on the touch panel of the drawing terminal T1 can be reproduced. For example, the trajectory is drawn as vector graphics on the drawing terminal side, and redrawn as vector graphics on the server S side. Accordingly, when the resolutions of the display devices on the drawing terminal side and the server S side are different, for example, even when the drawing terminal side is HD (high definition video) and the server S side is 4K resolution or 8K resolution, the drawing terminal Regardless of the difference in resolution between the display device on the server side and the display device on the server S side, it is possible to draw a smooth line. Even if the drawing terminal side is 4K resolution or 8K resolution and the server S side is HD, similarly, a smooth line is drawn regardless of the difference in resolution between the drawing terminal side and the server S side display device. It is possible.

(B) Attribute information • Shape, size, color, and transparency of the locus drawing (The shape of the locus drawing means that a pseudo writing instrument is defined as if the locus was described with a pencil, brush, magic, etc.) Yes, including basic shapes of handwriting such as, for example, circles, triangles, squares, brushes, magic, calligraphy, spotted patterns, etc.)
-Writing pressure (for example, 0.0 to 1.0) and inclination (for example, x, y, z, etc.)
(For example, the magnitude of the pen pressure affects the handwriting as the thickness and transparency of the pen. The inclination affects the handwriting as the thickness and the drawing pattern. This is a pen shaped like a brush or a calligraphy. This is because the ground plane to be drawn changes in this case, and the inclination also affects the shape of the blurred portion of the brush.)
・ Arrows (start, end, both, none)
-Edges, filters, and effects for lines (When a filter is applied, the trajectory is as follows. For example, drop shadows, side edges can be added, handwriting can be blurred, and emboss effects can be expressed. The effect is not a processed image of a drawn locus, such as a filter, but a visual effect such as a glowing particle (particle) added around the drawn locus.)

  The attribute information is information transmitted when an attribute for drawing a locus is designated in the drawing terminal T1. For a trajectory for which no attribute information is specified, handwriting is displayed in a predetermined (default) mode. On the server S side, if the attribute information is transmitted, the handwriting reproduced by the handwriting information is drawn and displayed in a mode corresponding to the attribute information, and when the attribute information is not transmitted, in a default mode. In addition, the desired trajectory can be drawn and displayed on the drawing terminal T1.

(C) Media information: Image / audio information other than drawing locus ・ Image data ・ Video data ・ Audio data ・ URI (Uniform Resource Identifier: media file path, URL, etc.)
(For example, if a URI is specified, the website and file contents of the link information are displayed in the background. More specifically, instead of sending media directly to the drawing terminal, files and content on the website are indirectly displayed. (The URI is used as the pointing method. The content is displayed as the background of the drawing area.)

(D) Device information: information indicating the state of the drawing terminal T1 ・ Power supply state by AC power supply ・ Battery level ・ Wi-Fi (registered trademark) reception sensitivity (RSSI)
·location information

(Control information)
FIG. 5 and the following disclose a content list of the control information D1 to Dn.
・ Image save command ・ Image clear command ・ Drawing screen lock command ・ Timer information (seconds, start, stop)
-Timer additional information (information executed after the timer ends)

  The drawing terminal T1 that has received the control information executes the processing as instructed by the control information.

“Operation of the drawing terminals T1 to Tn”
An example of an image displayed on the display unit 4 of each of the drawing terminals T1 to Tn is shown on the upper left side of FIG. As shown in FIG. 5, a drawing area 100, a pallet area 101, and a control area 102 are displayed on the display screens of the drawing terminals T1 to Tn.

  When the user of the drawing terminal T1 presses and slides the pen or the like on the drawing area 100 of the touch panel, trajectory information is generated and output. When the user specifies a mode for decorating the trajectory in the pallet area 101 or the control area 102, attribute information is generated and output.

  The trajectory information and the designated attribute information are transmitted to the server S in real time as drawing command information. The server S performs drawing and display in real time according to the trajectory information and the attribute information.

  The drawing terminals T1 to Tn store the drawn trajectory information and attribute information therein. Also, when a save command is received from the server S side, the image is stored internally.

  When clear information is sent from the server S as control information, the image (trajectory) drawn in the drawing area of the display unit 4 is deleted. When the background image data is sent from the server S, the background image in the drawing area of the display unit 4 is updated to the background image. When a video (file or streaming) is sent from the server S, the background image in the drawing area is updated to the video. When the URI is sent from the server S, the server accesses the designated media file or the site designated by the URL, reads the access destination display file, and displays the image. When the correctness determination is sent from the server S, the display of the drawing area and the outer frame is switched according to the correctness determination.

"Operation on server S side"
FIG. 7 shows an example of an image displayed on the display unit 9 of the server S. As shown in FIG. 7, on the display screen of the server S, a drawing area 200, a group name area 201, a guidance area 202, a control area 203, and a selection display screen area 204 are displayed.

  In accordance with the trajectory information and the attribute information sent from the drawing terminals T1 to Tn, the drawing is performed in the drawing area of the target terminal on the screen 203 (control area) and the screen 200 (multi-screen). By switching the target area according to the transmitted terminal ID and drawing, the information is drawn in parallel even when information is sent from a plurality of terminals at the same time.

  An image of any of the drawing terminals T1 to Tn selected on the control area screen 203 is displayed on the screen 204 in full screen.

  The server S displays the device information sent from the drawing terminals T1 to Tn in the area of the screen 203. In addition, a right / false judgment flag is set for each of the drawing terminals T1 to Tn, and the right / wrong judgment is transmitted to each of the drawing terminals T1 to Tn simultaneously.

  The server S issues commands such as an “image save command”, an “image clear command”, a “screen lock command”, timer information, and timer additional information to each of the drawing terminals T1 to Tn.

  The background image file and the background video (file or streaming) are transmitted to each of the drawing terminals T1 to Tn. Then, the background image / video is updated in each of the drawing terminals T1 to Tn.

  The server S transmits a URL (media file path, URL) to each of the drawing terminals T1 to Tn. Each of the drawing terminals T1 to Tn that has received the URL displays media according to the URI.

<Communication mode between drawing terminals T1 to Tn and server S>
Next, a communication mode of the drawing command information d1 to dn and the control information D1 to Dn will be described with reference to FIG. These pieces of information are transmitted in real time when drawing is performed by the drawing terminals T1 to Tn. At that time, communication traffic itself occurs, but communication is realized with extremely small data size because the subject is not the information with large capacity like image and video signals but the main information is the position information that is transmitted only when drawing the track information It is.

  Even if the resolution of the drawing terminals T1 to Tn is increased, the data size of the “drawing command” to be transferred is almost unchanged, and the server S can obtain an image having the same resolution as that of the drawing terminals T1 to Tn.

<Operation form 1>
This operation mode is an example in which the present drawing system is applied to a quiz program. As shown in FIG. 6, in the operation mode 1, a plurality of drawing terminals T1 to Tn are used at the same time. The drawing terminals T1 to Tn transmit the attribute of the trajectory specified in the pallet area 101 and the control area 102 to the server S together with the trajectory information of the pen or the like input to the drawing area 100. At this time, as shown in FIG. 7, on the server S, images having the same contents as those on the drawing terminals T1 to Tn are arranged and drawn in a list.

  As a backup function, a snapshot of the drawing area is stored for each stroke. Further, a snapshot of the drawing area is stored according to an image storage command from the server S side. Further, the drawing area can be cleared and locked according to an instruction from the server S. Furthermore, it is possible to perform visual display switching such as a change in display color of each of the drawing terminals T <b> 1 to Tn in accordance with the correct answer determination instruction. When an image, a video, and a URI are transmitted, the server S displays the transmitted image / video or the content of the URI as a background.

  On the server S side, the drawing contents of each terminal can be displayed in real time on the multi-screen 200 reproduced by the trajectory information sent from the drawing terminals T1 to Tn. Further, by selecting specific drawing terminals T1 to Tn on the multi-screen 200, the contents drawn in the drawing areas of the drawing terminals T1 to Tn are displayed on the selected image display screen 204 as shown in FIG.

  When the server S sends an image / video or a URI as a question sentence of the quiz program to the drawing terminals T1 to Tn, the background of the drawing area 101 on the drawing terminals T1 to Tn is switched to the designated content.

  By transmitting the screen lock command and the result of the correct answer determination from the server S in accordance with the deadline of the answer, the correct answer display can be switched at the drawing terminals T1 to Tn.

  From the server side, start / stop of the countdown of the drawing terminals T1 to Tn can be designated by the timer information, and the operation to be activated after the timer can be designated by the timer additional information.

  FIG. 9 shows an example of the operating state of the drawing system in the above-mentioned mode, that is, when all the drawing terminals T1 to Tn are in the same segment (studio or the like).

<Operation form 2>
This operation mode is an example in which the present drawing system is applied to a relay program (news / information program). FIG. 10 shows an operation mode in a case where some of the drawing terminals Tn-1 and Tn are outside the television station (for example, at a relay site). FIG. 11 also shows an embodiment in which a part of the drawing terminal is located outside, but is an example in which a multi-screen is not used as the display screen on the server S side.

  The operation on the relay server RS side is as follows. When some of the drawing terminals Tn-1 and Tn are outside the studio and cannot be directly connected to the server S due to security, the communication between the drawing terminals and the server S is performed via the relay server RS. The relay server RS manages information that associates the drawing terminal ID with the IP address.

  The relay server RS sends the drawing command information and control information sent from the drawing terminals T1 to Tn to the server S, and distributes the drawing command information and control information sent from the server S to each of the drawing terminals T1 to Tn. Send.

  Next, a mode of a relay program such as a news / information program will be described. Here, for example, it is assumed to be used for on-site reports in news / information programs and weather forecasts. The basic operations of the drawing terminals T1 to Tn and the server S are the same as described above, but the following functions are added in consideration of operation in a program.

  On the drawing terminals T1 to Tn side, images and video files shot at the site can be set as background images as explanatory diagrams. At this time, the file is transferred to the server S and used as a background image of the terminal drawing area on the server S.

  In addition to the screen operation (pen operation) on the drawing terminals T1 to Tn, drawing can also be performed using the trajectory information sent from the server S. Thus, an instruction (camping) by handwriting can be performed from the station side (server S) to the site (drawing terminals T1 to Tn). Since the drawing terminals T1 to Tn often do not exist in the same subnetwork as the server S, the connection between the drawing terminals T1 to Tn and the server S is performed via a relay server.

  The server S can draw in the drawing area, but sends the trajectory information at the time of drawing to the designated drawing terminal. The drawing terminal performs drawing according to the sent locus information.

<Operation form 3>
FIG. 12 shows a system configuration in a case where all of the drawing terminals T1 to Tn are outside (such as a relay site). The basic functions of the operations of the drawing terminals T1 to Tn are the same as those in the above-described example. In addition, the following functions are possible. That is, drawing can be performed in the drawing area on the drawing terminal T1 to Tn side by the control information D1 to Dn sent from the server S. Thus, the drawing terminals T1 to Tn can simultaneously execute the drawing on the own terminal and the drawing based on the instruction command from the server S.

  In response to a request from the server S, a snapshot image of the drawing area can be sent to the server S. Further, an image photographed on site can be used as a background image, and can be reflected on the background image on the server S side. Furthermore, terminal-side movements such as playback, stop, and trick play can be sent to the server S to synchronize the operations.

  The server S can perform the following functions in addition to the functions described above. Since the drawing can be performed on the server S side, the trajectory information can be transmitted to the designated drawing terminal in real time simultaneously with the drawing. It is also possible to send a snapshot of the drawing screen to a designated drawing terminal. It is possible to instruct the server S to send the snapshots of the drawing terminals T1 to Tn, and to reflect the sent image data in the drawing area of the target drawing terminal of the server S.

<Operation form 4>
FIG. 13 shows a display example on the server S side when operating at an art event or the like. This is used, for example, when the drawing area on the server S side is regarded as a huge canvas and one image is created using images from a plurality of drawing terminals T1 to Tn. The drawing drawn by each of the drawing terminals T1 to Tn is transmitted to the server S as trajectory information, and the server S draws sequentially. The trajectory information gathered in the server S is also transmitted to each of the drawing terminals T1 to Tn, and the drawing terminals T1 to Tn that have received the drawing draw. This makes it possible to create an image while sharing one screen.

<Others>
As a development of the operation of this drawing system, it is possible to aggregate handwritten answers from people in and outside Japan. In other words, it is possible to construct a system that can be used as a drawing terminal T1 to Tn by using, for example, a smartphone from homes and offices in Japan and abroad without being in a studio.

  Images handwritten on the tablet screen from the relay site, such as weather and disaster information, can be reproduced in the studio using only the net line without using image / video data transmission with heavy data volume.

  When commentary is performed from a studio where the user is going to broadcast a soccer broadcast or the like, the illustration of a commentator who is on the site can be reproduced on the station side.

  It is possible to know the instruction to the relay drawing terminal from the sub-network in the form of a campaign, and it is also possible to simultaneously transmit a plurality of drawing terminals.

  Provided is a drawing system that can be used for program production inside and outside a studio of a television station.

T1 to Tn drawing terminal, AP communication device, S server, ANT antenna, d1 to dn drawing command information, D1 to Dn control information, 1 drawing system, 2 bus, 3 control unit, 4 ... display unit, 5 ... communication unit, 6 ... memory, 7 ... bus, 8 ... control unit, 9 ... display unit, 10 ... communication unit, 11 ... memory, 12 ... control unit, 13 ... communication unit, 14 ... bus, 15: memory, 100: drawing area, 101: pallet area, 102: control area, 200: drawing area, 201: group name area, 202: guide area, 203: control area, 204: selection display screen area

Claims (7)

A drawing system comprising: a plurality of drawing terminals that transmit drawing command information input from a touch panel superimposed on a display unit; and a server that receives the drawing command information and generates a display image,
The drawing command information is drawing command information including a drawing locus on the touch panel and attribute information for the drawing locus,
The server generates a display image that displays a list of drawing trajectories in the plurality of drawing terminals based on the drawing command information from the plurality of drawing terminals.
Drawing system.   The drawing system according to claim 1, wherein the drawing system is configured to be able to transmit control information including display control information for the display unit from the server to the drawing terminal.   The drawing system according to claim 1, wherein command information for causing the display unit to display drawing command information from the server can be transmitted.   The drawing system according to claim 1, wherein a relay server intervenes between a part or all of the plurality of drawing terminals and the server.   The drawing system according to claim 1, wherein an access point communication device that relays communication between the plurality of drawing terminals and the server is interposed. A server configured to be able to communicate with a plurality of drawing terminals,
Receiving drawing instruction information including a drawing locus on the touch panel of the plurality of drawing terminals and attribute information for the drawing locus;
Generating a display image for displaying a list of drawing loci in the plurality of drawing terminals based on the received drawing command information;
server. A method of displaying a drawing trajectory from a plurality of drawing terminals,
Receiving drawing instruction information including a drawing locus on the touch panel of the plurality of drawing terminals and attribute information for the drawing locus;
Generating a display image for displaying a list of drawing trajectories in the plurality of drawing terminals based on the received drawing command information;
How to display drawing locus.

Images