KR20080070348A - Rendering server system having multiple gateway, gateway system therefor, and method thereof - Google Patents

Abstract

A rendering server system with a multiple gateway structure, a gateway system used for the same, and a rendering method are provided to offer volume visualization service to a mobile terminal user by co-work of the mobile terminal through a client-server system. A rendering server system performs a rendering work by the interaction between a rendering server(100), the multiple gateways(200-1,200-2,...,200-n) which are connected parallel to the rendering server, and the client mobile terminals(300-1,300-2,...,300-n) which perform the rendering work by connecting to the gateways. Each of client mobile terminals perform the rendering by registering in sessions(201-1,201-2,...,201-n), and through the co-work of the client mobile terminals registered in the same session. Each of client mobile terminals register in sessions to perform the rendering work through the co-work of the client mobile terminals registered in the same session. The rendering server performs the rendering work by using the massive original volume data and the basic data transmitted from the client mobile terminals through the gateways.

Description

Rendering server system having multiple gateway structure, gateway system and rendering method used therein {Rendering server system having multiple gateway, gateway system therefor, and method}

1 is a schematic diagram illustrating the concept of the present invention

2 is a block diagram showing a configuration of a rendering server of the present invention.

3 is a block diagram showing the configuration of a gateway of the present invention;

4 is a flow chart illustrating a method of the present invention.

5 is a screen of each client mobile terminal in the process of broadcasting a rendering context.

6 is a flowchart illustrating a method of changing host privileges.

7 is a screen of each client mobile terminal when changing the host authority

8A and 8B are output screens of each client mobile terminal in each process of the present invention.

9 is a block diagram showing the configuration of a client mobile terminal of the present invention.

The present invention relates to a system and method for performing a rendering operation, and more specifically, to a rendering server system of a multi-gateway structure that supports rendering operations through cooperation between client mobile terminals such as a mobile phone and a personal digital assistant (PDA); A gateway system used in the system and a method therefor.

Recently, due to the development of wireless communication technology, the mobile device market focusing on mobile phones and PDAs is rapidly expanding. In particular, the growth of the mobile industry is accelerating thanks to the development of ubiquitous computing technology that can connect to the network freely regardless of time and place, development of next generation smartphones, and commercialization of digital multimedia broadcasting (DMB).

In addition, the commercialization of Wibro, the next-generation wireless Internet service, is brightening the outlook for the mobile industry. Based on these changes in the mobile environment and the expansion of the standard graphics library OpenGL-ES, efforts are being actively made to implement advanced PC-level 3D games or graphics applications using portable mobile devices.

Volume rendering algorithms for generating three-dimensional images from massive amounts of data require a lot of computational cost and large memory space. Therefore, due to hardware limitations of current commercial mobile terminals, it is almost impossible to port algorithms implemented on high-performance workstations or PCs to mobile phones or PDAs as they are.

In particular, in the case of performing volume rendering using medical information, accurate diagnosis and treatment are required only when the resultant image matches the human body that is actually encountered. Therefore, more precise calculation and more memory capacity are required. There was a problem that can not perform this function.

Given the rapid development of mobile computing technology, we can expect the possibility of real-time visualization of medical information using mobile terminals equipped with high-performance graphics accelerators within a few years, but this effect could not be expected in the current computing environment. .

In order to solve the above problems, an object of the present invention is to provide a system capable of providing a volume visualization service to a mobile terminal user through a cooperative operation of the mobile terminal through a client-server system using the mobile terminal as a client terminal. .

Another object of the present invention is to provide a gateway system and a rendering method for rendering a mediation between a rendering server performing a rendering operation and a client mobile terminal performing a cooperative operation. .

In order to achieve the above object, the present invention provides a rendering server for receiving a predetermined data for rendering transmitted from a plurality of client mobile terminal to perform a rendering operation based on the received data; And a plurality of gateways managing at least one session for cooperating with the plurality of client mobile terminals for the rendering operation, and for mediating communication between the client mobile terminal registered in the session and the rendering server. A rendering server system having a multi-gateway structure is provided.

Here, the gateway generates a session in which the first client mobile terminal is a host terminal according to a request of the connected first client mobile terminal, and stores information of the second client mobile terminal that selects each session for each generated session. Session management unit for; A network communication unit configured to communicate with a rendering server that performs a rendering operation and a communication with the first client mobile terminal and the second client mobile terminal; Basic data and rendering context for the rendering task received from the host terminal and basic data for the rendering task received from the second client mobile terminal are transmitted to the rendering server through the network communication unit, and received from the rendering server. A controller for transmitting the processed result image to the host terminal through the network communication unit; A rendering context storage unit for storing a rendering context received from the host terminal; And a broadcasting unit configured to be broadcast to a client mobile terminal registered in the session through the network communication unit stored in a rendering context storage unit when a request from the host terminal is received.

Meanwhile, in order to achieve the above object, the present invention comprises the steps of generating a session in which the first client mobile terminal as a host terminal according to a request of the connected first client mobile terminal; Registering the second client mobile terminal information with the second client mobile terminal when the second client mobile terminal selects and accesses a session generated by the first client mobile terminal; Receiving basic data and a rendering context for rendering from the host terminal; Broadcasting a rendering context received from the host terminal to the second client mobile terminal when the host terminal requests a request; Receiving basic data for a rendering operation from the second client mobile terminal; Transmitting basic data for rendering work received from the host terminal and the second client mobile terminal and a rendering context received from the host terminal to a rendering server that performs rendering to perform rendering work; And receiving the requested rendering result image from the rendering server and transmitting the received image to the host terminal. The rendering method includes a plurality of wireless computer assisted cooperation through a gateway system.

On the other hand, in order to achieve the above object, the present invention provides a computer readable recording medium having recorded thereon a program for realizing the above method.

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

Figure 1 shows a schematic diagram for explaining the present invention.

The system of the present invention performs rendering by accessing each gateway and a rendering server 100 that performs rendering, a gateway 200-1, 200-2,..., 200-n connected in parallel to the rendering server 100. The rendering operation is performed through the interaction of the client mobile terminals 300-1, 300-2, 300-3, ... 300-n.

Each client mobile terminal 300-1, 300-2, 300-3, ... 300-n is registered in a session 210-1, 210-2, 210-3, ... 210-n managed through a gateway. Rendering is performed through cooperative work between client mobile terminals registered in the same session.

The rendering server and the basic data for rendering transmitted from the client mobile terminal (300-1, 300-2, 300-3, ... 300-n) through the gateway (200-1, 200-2, ... 200-n) Rendering is done using the vast amount of original volume data.

Here, rendering refers to a process or a technique for creating realistic three-dimensional images while taking into account external information such as light source, position, and color using computer graphics, and is a screen composed of two-dimensional arrays from a three-dimensional database of geometric data. The process of creating an image of a jacket.

This rendering method uses wireframe rendering that draws only the edges of objects, calculates the refraction and reflection of the ray, and traces the path back to the lighting where the ray began. Ray tracing rendering to determine the resolution, and radiosity rendering to render while comprehensively considering the relationship with other objects around when the ray is diffusely reflected.

The rendering performed in the rendering server 100 of the present invention is not limited to the method, and may be performed using any one of the above rendering methods.

As the number of mobile client terminals connected to the gateway 200 increases, the amount of data to be processed by the gateway also increases. In the situation where a plurality of mobile client terminals simultaneously access a single gateway, several hundred megabytes are used. If you need to filter the volume data up to tens of gigabytes to the size you request and retransmit the resulting data, there is a risk of serious bottlenecks at the gateway.

Therefore, the present invention is not a form in which all mobile client terminals are centrally connected to a single gateway. Instead, a plurality of gateways have multiple gateways, and each gateway maintains a connection with a rendering server. It is structured to manage work.

Once the mobile client terminals connect to a particular gateway, they can either join the currently establishing session or create a new session. Every session has a unique session name, and management of that session is done through the gateway that assigned the session name. In this way, natural load balancing can be maintained by establishing a hierarchical relationship between mobile clients, gateways, and rendering servers.

2 is a block diagram showing the configuration of the rendering server 100 of the present invention.

The rendering server 100 of the present invention transmits and receives data to and from the gateway 200 through the network communication unit 110, and the received data is each node 121-1, which is arranged in parallel by the master node 120. ..., rendering operations in parallel through 121-n).

The master node 120 analyzes the signal received through the network communication unit 110 to determine which session the signal is from, and delivers the signal to the corresponding node.

Each node 121-1, ... 121-n uses session data 201-1, 201-2, 201-3,..., 201-n generated in the gateway using data stored in the volume data DB 130. Performs the requested rendering operation through any one session. Since the rendering method is generally known, a detailed description thereof will be omitted.

The volume data DB 130 stores various data for volume rendering. Such data can store not only medical data such as CT (Computed Tomography) and MRI (Magnetic Resonance Imaging), but also data for sectional images and high quality rendered images for various types of simulation results from engineering and natural sciences. have.

3 is a block diagram showing the configuration of the gateway of the present invention.

The gateway 200 of the present invention includes a session managing unit 210, a network communication unit 220, a control unit 230, a rendering context storage unit 240, an image storage unit 250, a filtering unit 260, and a broadcasting unit ( 270).

The session management unit 210 creates a session in the gateway 200, and the host authority among the generated session information, that is, the list of the created session, the information of the client mobile terminal registered in the session, and the client mobile terminal registered in the session Information about the assigned client mobile terminal is stored, and is responsible for managing the entire session such as processing of changing the host authority of the session.

The information of the client mobile terminal may include identification information of the client mobile terminal or the user, socket information, a session number to which the client mobile terminal belongs, and device information of the client mobile terminal.

The device information of the client mobile terminal is information for reference when transmitting a result of the rendering operation such as the resolution supported by the terminal, and the like. The information may be stored in the session managing unit 210 or a separate storage unit (not shown). It may be stored through.

The network communication unit 220 is responsible for data transmission and reception with the client mobile terminal connected to the gateway 200 and data transmission and reception with the rendering server 100.

The rendering context storage unit 240 stores the rendering context received from the terminal set as the host terminal among the client mobile terminals registered in the session.

The image storage unit 250 stores the image worked by the rendering server 100 at the request of the client mobile terminal set as the host terminal.

The controller 230 controls each component including the network communication unit 220 so that the data received from the client mobile terminal 300 is transmitted to the rendering server 100 and the rendering job received from the rendering server 100. The resultant image is transmitted to the client mobile terminal which requested the resultant image.

The filtering unit 260 adjusts the size of data according to the device information of each client mobile terminal and the resolution of the requested result image when transmitting the result image rendered by the rendering server 100 to the client mobile terminal.

In detail, the filtering unit 260 calculates at what level image data to be transmitted should be filtered using device information of each terminal stored in the session managing unit 210 or a separate storage unit. In this case, one step means that the width, length, and depth of the image data are reduced by 0.5 times.

개 복셀들을 대상으로 필터링을 수행하여 이를 하나의 복셀로 만들고, 필터링된 영상 데이터를 모바일 클라이언트 단말기에게 보낸다. 이후에 사용자가 더 높은 해상도의 부분 영상 데이터를 요청할 때마다 필터링 작업은 동일한 방식으로 반복 수행된다.Knowing the size of the memory installed in the mobile client terminal and the resolution of the selected image data, the value of the step can be obtained simply. Then from the current volume data

The filtering is performed on the dog voxels into a single voxel, and the filtered image data is sent to the mobile client terminal. Subsequently, whenever the user requests higher resolution partial image data, the filtering operation is repeatedly performed in the same manner.

The device information of each client mobile terminal may be directly input by the user when registering or using the service, or may be known by receiving device information stored in the client mobile terminal when communicating with the client mobile terminal.

The broadcasting unit 270 may request a request from the host terminal stored in the rendering context registered with the host terminal in the rendering context storage unit 240 and the image storage unit 250 when a request is received from the client mobile terminal set as the host terminal. Broadcast the result image to all client mobile terminals registered in the session.

When broadcasting a rendering context, when broadcasting the rendering context again after broadcasting the rendering context, it is preferable to compare both rendering contexts so that only the modified part is transmitted.

Referring to the configuration of the gateway 200 in more detail as follows. 4 is a flow diagram illustrating a method of the present invention centered on a gateway 200.

When the user connects to the gateway 200 through a client mobile terminal such as a mobile phone or a PDA (401), the controller 230 displays a list of sessions registered in the session manager 210 through the network communication unit 220. Send to the client mobile terminal (402).

Each session has a unique name that represents the session, and the connected user can view the name of the session or the description of the session charged to it and see if there is a session that does what he or she wants to do. You will be able to create a session and decide whether to proceed.

If the user wants to create a new session (403), the session manager 210 generates a session with the client mobile terminal (hereinafter referred to as 'first client mobile terminal') of the user who wants to create a session as a host terminal (404) If the user wants to join a previously created session, the client mobile terminal information of the user is registered in the desired session (405).

If another user wants to participate in the session that the user has joined or created, the session manager 210 registers information of the user's client mobile terminal (hereinafter referred to as 'second client mobile terminal)' in the session (406).

The first client mobile terminal set as the host terminal and the second client mobile terminal registered in the session transmit data including basic data for the rendering operation, and the control unit 230 of the gateway 200 transmits the data including the basic data for the rendering operation. In step 407, the rendering server 100 transmits the rendering server 100 to the rendering server 100 through the rendering server 100.

In this case, the basic data transmitted may include which data of the volume data DB 130 of the rendering server 100 is to be used, and a portion to be rendered (for example, when rendering a human body, which portion of the human body is to be rendered. When the rendering job in the rendering server 100, such as whether the user should include the basic settings.

The first and second client mobile terminals registered in the session transmit a rendering context for rendering in addition to the basic data. At this time, the rendering context transmitted from the host terminal is stored in the rendering context storage 240.

When the client mobile terminals other than the host terminal request rendering by transmitting their own rendering context, the rendering server 100 performs a separate rendering task with the host terminal.

The rendering context is the linking OpenGL-ES call to the device context. Depending on which rendering context is used, the rendering result can be different. The host terminal broadcasts its rendering context to other client mobile terminals. The rendering contexts of the host terminals can be shared with each other.

When there is a request for broadcasting the rendering context from the first client mobile terminal set as the host terminal (408), the broadcasting unit 270 is stored in the rendering context storage unit 240 through the network communication unit 220. The rendering context of the host terminal is transmitted (409).

In this case, when broadcasting the rendering context again after broadcasting the rendering context, it is preferable to compare both rendering contexts so that only the modified part is transmitted.

A screen at each client mobile terminal in the process of broadcasting a rendering context is shown in FIG. 5.

In FIG. 5, the screen on the left shows an output screen of the first client mobile terminal currently set as the host terminal, and the screen on the right shows the second client mobile terminal participating in the session in which the first client mobile terminal is set as the host terminal. Displays the output screen.

As shown in (a) of FIG. 5, the first client mobile terminal and the second client mobile terminal perform tasks using different rendering contexts.

When the first client mobile terminal serving as the host terminal wants to broadcast its rendering context and selects it from the menu, the fact is output on the screen of the second client mobile terminal as shown in FIG. If the user of the second client mobile terminal approves it, as shown in FIG. 5C, the rendering context of the first client mobile terminal is transmitted to the second client mobile terminal so that both client mobile terminals have the same rendering context. You can do it.

In this case, the rendering context in which the second client mobile terminal is working may be stored in the terminal without being deleted unless the user wants to.

Users of each client mobile terminal who participated in the session can broadcast their own rendering context with host authority, so they can compare and analyze the broadcast rendering contexts with their own rendering contexts to compare their opinions and collaborators' opinions. Coordination and cooperation are possible.

In addition, when a new client mobile terminal joins a session, a task can be started with the most recent rendering context stored in the rendering context storage unit 240, thereby saving time for a newly joined user. There is also.

If the client mobile terminal wants to receive the result image worked on the rendering server 100, the controller 230 receives the result image worked from the rendering server 100 through the network communication unit 220 and transmits the result image to the client mobile terminal. To be transmitted (410).

At this time, it is preferable that the resultant image transmitted to the client mobile terminal set as the host terminal is stored in the image storage unit 250.

In this case, when the host terminal later sends a signal to broadcast the volume rendering image, the client can send the resulting image data already stored in the gateway to the client terminals without the volume rendering image being transmitted from the PDA to the gateway. have. In this way, unnecessary communication of data can be prevented.

If there is a request for broadcasting the resultant image from the host terminal, the broadcasting unit 270 broadcasts the resultant image stored in the image storage unit 250 to each client mobile terminal participating in the session (412). .

Meanwhile, in the system of the present invention, host authority in one session is preferably given to only one client mobile terminal, and host authority may be changed according to a request of each user participating in the session. 6 is a flowchart illustrating a method of changing host authority.

First, when a host authority change request signal is received from a second client mobile terminal that does not have host authority (501), the session manager 210 receives the first client currently configured as the host terminal through the network communication unit 220. Send to mobile terminal (502).

When the session management unit 210 receives a signal for acknowledging this from the host terminal (503), the host authority of the first client mobile terminal currently set as the host terminal is released, and the second client mobile terminal requesting the host authority is hosed. The host authority is moved in a manner of setting to a terminal terminal (504).

The screen at each client mobile terminal when changing host authority is shown in FIG. 7.

As shown in FIG. 5, in FIG. 7, the screen on the left shows the output screen of the first client mobile terminal currently set as the host terminal, and the screen on the right shows the first client mobile terminal participating in the session set as the host terminal. The output screen of the second client mobile terminal is shown.

If the second client mobile terminal requests to change the host authority as shown in FIG. 7 (a), and the first client mobile terminal approves it as shown in (b) of FIG. 7, in FIG. 7 (c) As described above, the second client mobile terminal is set as a host terminal having host authority.

8 illustrates a screen on which a job is performed through the same process as in FIGS. 4 to 7. For convenience, the terminal on the left is called a first client mobile terminal, and the terminal on the right is called a second client mobile terminal.

8A illustrates an output screen when the rendering context is broadcast while the second client mobile terminal is a host terminal. At this time, if the user of the first client mobile terminal approves the reception of the broadcast rendering context, both client mobile terminals can work using the broadcast rendering context.

8B illustrates an output screen when the first client mobile terminal requests a host authority change. If the second client mobile terminal approves the host authority change, the host authority is moved.

FIG. 8B (c) is a screen when the first client mobile terminal set as the host terminal requests to broadcast the resultant image. When the image worked by the request of the host terminal is broadcast, the first client mobile terminal and the second client mobile terminal output the same result image as shown in (d) of FIG. 8B.

9 is a block diagram showing the configuration of a client mobile terminal used in the present invention.

The client mobile terminal 300 used in the present invention includes a user interface 310, a network communication unit 320, a controller 330, and a renderer 340.

 The user interface 310 receives various settings from the user. The method of receiving an input is not limited to a method of receiving an input using a touch pad, a method of receiving an input using a keyboard connected to a client mobile terminal, a mouse, or the like.

The network communication unit 320 is responsible for data transmission and reception with the gateway 200 through wireless communication.

The rendering unit 340 generates, stores, and changes a rendering context according to a user's setting, and outputs the rendered context to a screen when receiving a rendered image, and performs a function as a client module for rendering.

The controller 330 transmits the data input through the user interface 310 and the rendering context worked through the renderer 340 to the gateway 200, and when the requested data is received from the gateway 200. The function of each component is controlled such that data is stored in a memory in the renderer 340.

The method of the present invention can also be embodied as computer readable code on a computer readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, and the like, and may also be implemented in the form of a carrier wave (for example, transmission over the Internet). Include. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

As described above, according to the present invention, a general user having a client mobile terminal such as a PDA can be connected to a wireless network, regardless of time and place. The advantage is that it is possible to receive a photo-realistic image.

Claims (17)

Generating a session in which the first client mobile terminal is a host terminal according to a request of a connected first client mobile terminal; Registering the second client mobile terminal information with the second client mobile terminal when the second client mobile terminal selects and accesses a session generated by the first client mobile terminal; Receiving basic data and a rendering context for rendering from the host terminal; Broadcasting a rendering context received from the host terminal to the second client mobile terminal when the host terminal requests a request; Receiving basic data for a rendering operation from the second client mobile terminal; Transmitting basic data for rendering work received from the host terminal and the second client mobile terminal and a rendering context received from the host terminal to a rendering server that performs rendering to perform rendering work; And And receiving the requested rendering result result image from the rendering server and transmitting the received image to the host terminal. The method of claim 1, wherein the resultant image is stored in the gateway system. If the broadcasting request is received from the host terminal, broadcasting the stored result image to the second client mobile terminal registered in the session; and supporting a plurality of wireless computers through a gateway system. How to render via. The method of claim 1, wherein broadcasting the rendering context is When broadcasting the rendering context again after broadcasting the rendering context, only the modified portion is transmitted, the rendering method through a plurality of wireless computer support cooperation through the gateway system. The method of claim 1, wherein the transmitting of the rendered result image to the host terminal comprises adjusting a size of data to be transmitted according to the device information of the host terminal and the resolution of the processed result image. A rendering method through a plurality of wireless computer support cooperation through a gateway system characterized in that. The method of claim 1 wherein the method is When the host authority change request is received from the second client mobile terminal, transmitting the host authority change request to the first client mobile terminal configured as a host terminal; And When the host authority change request is granted from the first client mobile terminal, releasing the host authority of the first client mobile terminal and setting the second client mobile terminal as a host terminal; A rendering method through a plurality of wireless computer support cooperation through a gateway system characterized in that. A session manager configured to generate a session using the first client mobile terminal as a host terminal according to a request of the connected first client mobile terminal, and to store information of the second client mobile terminal selecting each session for each generated session; A network communication unit configured to communicate with a rendering server that performs a rendering operation and a communication with the first client mobile terminal and the second client mobile terminal; Basic data and rendering context for the rendering task received from the host terminal and basic data for the rendering task received from the second client mobile terminal are transmitted to the rendering server through the network communication unit, and received from the rendering server. A controller for transmitting the processed result image to the host terminal through the network communication unit; A rendering context storage unit for storing a rendering context received from the host terminal; And And a broadcasting unit configured to broadcast to the client mobile terminal registered in the session through the network communication unit stored in the rendering context storage unit when a request from the host terminal is received. Gateway system for rendering via rendering. The system of claim 6, wherein the gateway system is And an image storage unit for storing the resultant image worked from the rendering server. The broadcasting unit may further include a function of broadcasting to the client mobile terminal registered in the session through the network communication unit when a broadcasting request for the stored result image is received from the host terminal. Gateway system for rendering through computer-assisted collaboration. The method of claim 6, wherein the broadcasting unit Gateway system for performing a rendering through a plurality of wireless computer support cooperation, if the broadcast is already broadcast and then the rendering context, only the modified portion is transmitted. The system of claim 5, wherein the gateway system is And a filtering unit configured to adjust the size of data to be transmitted according to the device information of the host terminal and the resolution of the processed result image when transmitting the rendered result image to the host terminal. Gateway system for rendering with collaborative wireless computer support. The method of claim 6, wherein the session management unit When the host authority change request is received from the second client mobile terminal, the host authority change request is transmitted to the first client mobile terminal configured as a host terminal, and the host authority change request is transmitted from the first client mobile terminal. And if approval is made, the host system of the first client mobile terminal is released, and the second client mobile terminal is configured as a host terminal. A rendering server receiving predetermined data for rendering transmitted from a plurality of client mobile terminals and performing a rendering operation based on the received data; And And a plurality of gateways managing at least one session for cooperating with the plurality of client mobile terminals for the rendering operation, and for mediating communication between the client mobile terminal registered in the session and the rendering server. Rendering server system having multiple gateway structure. The method of claim 11, wherein the gateway is A session manager configured to generate a session using the first client mobile terminal as a host terminal according to a request of the connected first client mobile terminal, and to store information of the second client mobile terminal selecting each session for each generated session; A network communication unit configured to communicate with the first client mobile terminal and the second client mobile terminal and with the rendering server; Basic data and rendering context for the rendering task received from the host terminal and basic data for the rendering task received from the second client mobile terminal are transmitted to the rendering server through the network communication unit, and received from the rendering server. A controller for transmitting the processed result image to the host terminal through the network communication unit; A rendering context storage unit for storing a rendering context received from the host terminal; And A rendering server including a broadcasting unit configured to be broadcast to a client mobile terminal registered in the session through the network communication unit stored in a rendering context storage unit when a request is received from the host terminal. system. The method of claim 12, wherein the gateway is And an image storage unit for storing the resultant image worked from the rendering server. The broadcasting unit further includes a function to broadcast to the client mobile terminal registered in the session through the network communication unit when a broadcasting request for the stored result image is received from the host terminal. Rendering server system with. The method of claim 12, wherein the broadcasting unit Rendering the rendering context again after broadcasting the rendering context, the rendering server system having a multi-gateway structure characterized in that only the modified portion is transmitted. The method of claim 12, wherein the gateway is And a filtering unit configured to adjust the size of data to be transmitted according to the device information of the host terminal and the resolution of the processed result image when transmitting the rendered result image to the host terminal. Rendering server system with structure. The method of claim 12, wherein the session management unit When the host authority change request is received from the second client mobile terminal, the host authority change request is transmitted to the first client mobile terminal configured as a host terminal, and the host authority change request is transmitted from the first client mobile terminal. If the approval is made, the host server of the first client mobile terminal is released, the rendering server system having a multi-gateway structure, characterized in that for setting the second client mobile terminal as a host terminal. A computer-readable recording medium having recorded thereon a program for realizing the method according to any one of claims 6 to 10.

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