KR20030084164A - Dynamic communication method and system using remote method invocation - Google Patents

Abstract

PURPOSE: A dynamic communication method using an RMI(Remote Method Invocation) call and a system thereof are provided to perform a session connection only when data is transmitted by using an RMI function, thereby reducing load of a client system or a server system. CONSTITUTION: A computer system(32) selects a computer system(34) for performing dynamic communication, transmits an RMIC(RMI Communication) packet to the selected computer system(34), and requests an RMIC connection. The computer system(34) decides a called method, a communication method, a connection port, and connection setup showing data, and executes the called method. The computer system(34) opens a designated connection port, and transmits an RMIC response signal for a connection request. The computer system(32) receives the RMIC response signal, and executes a communication application. A session setup is carried out between the computer systems(32,34).

Description

DYNAMIC COMMUNICATION METHOD AND SYSTEM USING REMOTE METHOD INVOCATION

The present invention relates to a method and system capable of dynamic communication with a server system or client system using remote method invocation (RMI).

A complex network consisting of a plurality of independent networks interconnected is called an internetwork, and a method of connecting a plurality of independent networks into a single integrated network, that is, an internetworking process between the independent networks. It is called.

As a general example of using internetworking, a LAN user constituting an independent network may exchange data with another LAN user connected through a wide area network (WAN). In this case, connecting the LAN and the WAN may be referred to as internetworking. Since such internetworking connects independent networks, routing to determine services of each layer of a network, a protocol structure used in an independent network, an address structure of an independent network, and a data transmission path is performed. Consider the routing and the size of the data packet to be transmitted.

Recently, the use of the Internet to connect independent networks distributed around the world has been activated so that users using these independent networks can access other remote networks and transmit data therebetween. The Internet is a transmission control protocol / Internet protocol between a plurality of unit networks divided by Internet Protocol (hereinafter referred to as IP) addresses and a plurality of hosts having individual IP addresses provided in each unit network. Control Protocol / Internet Protocol: hereinafter referred to as TCP / IP). In addition, the Internet is a data communication network capable of performing data communication through an independent network such as a LAN or a public switched telephone network (PSTN). On the other hand, IP corresponds to the network layer (Network Layer), which is the third layer in the OSI (Open System Interface) 7 layer structure, a part in which the network dependent part and the network independent part are combined. This IP address is the only address on the Internet. The IP address is basically 32 bits, and can be divided into a part indicating a subnet on the Internet and a part indicating a host on the subnet.

In general, the network model for connecting users can be divided into a centralized, client / server model, and a peer-to-peer method for connecting users individually.

Centralized, the initial network model, divided into host and terminal to provide the best performance, fault tolerance, and security between the host and terminal. In other words, the host provides a batch of functions for querying business data for a series of tasks required from a plurality of terminals, maintains the data integrity, and blocks security from unauthorized users. Secured. As a result, very little work was done between the host and the terminal. However, this centralized environment is incapable of reacting immediately to change, resulting in service delays. In addition, when using a PC as a terminal device, the micro-computing environment through the PC has a problem in data integrity and security functions during data processing. However, because they had advantages that they did not have, they began to find ways of coexistence over time, which is a client / server model.

This client / server model is a model that is mainly implemented and used on the Internet at this time, and server system resource sharing is possible.

1 shows a schematic diagram of a general client / server model.

Referring to FIG. 1, the client / server model distinguishes a server 10 that stores data and a client 14 that requests and displays data. Therefore, the work is performed by dividing the work (Back end) at the server 120 for storing and providing data and the work (Front end) at the client 14 requesting specific data to the server 10. When a query requesting data is transmitted from the client 14 to the server 10, the server 10 extracts the corresponding data from the database, performs the requested operation, and only the result is transmitted through the network. 14) to provide.

In this client / server model, the server 10 waits for a service request from the client 14 as a provider of the service, and the client 14 makes a connection request to the server 10 to request a service. In addition, the client 14 and the server 10 are not dependent on hardware. That is, no matter what operating system (OS) or hardware the client 14 and server 10 use, the server 10 must provide the same service to the client 14. In addition, even if the client / server system increases or decreases in size, such as increasing the number of clients 14 or increasing the server 10, there should be no influence on the operation of the overall system.

In this way, using the Internet, users can also have video conferencing to face-to-face conversations with people in different countries, send or receive the necessary information, and e-mail (Electronic mail: e- You can also send and receive mail and messages via mail or messenger. In addition, various data such as a text file, an image file, a video, etc. can be provided through a web site provided with a server, and a user can search for desired information from an infinite sea of information.

On the other hand, Peer-to-Peer model is a method that can directly send and receive messages or data by establishing a direct connection between users without having a separate server.

Figure 2 shows the configuration of the Peer-to-Peer model.

Referring to FIG. 2, the peer-to-peer model does not include a separate server, and transmits data and messages between user computer systems 20 and 22 directly connected to each other. In other words, each computer system 20 and 22 simultaneously transmits and receives messages at the same level. In general, the client / server model is intended for ten or more users who are not in the same location, so a computer system with sufficient storage capacity and computing power is installed on the server. Peer-to-peer networks, on the other hand, are also called workgroups, and are often used to network when less than 10 computer systems are in the same location. The most commonly used security method for peer-to-peer networks is share level security, which requires access to a specific password for resources such as directories, files, and printers. Therefore, the Peer-to-Peer model has been mainly used for connecting computer systems of users working in the same local area LAN.

This one-to-one peer-to-peer model has higher data transfer speed and reliability than client / server model, and can keep messages and data secure. On the other hand, since a single user manages a message or data transmission for a specific user, and there is no integrated management for a user, efficiency is inferior and management of each user is difficult. Recently, however, services that connect computer systems in a peer-to-peer manner over the Internet and directly send and receive messages and data among users have been greatly activated.

The main services are Napster and Soribada.

The Napster program is produced by Napster, which connects users connected to the Napster server using the Napster program. In other words, user information and mp3 files owned by the corresponding user are searched from the user connected to the Napster server through the Napster program, so that other users can check it. Therefore, the user using the Napster program can check in real time the information about the other user using the Napster program and the mp3 file held by the user. In particular, the Napster server does not download mp3 files from the user and stores them separately. The Napster server provides only information about the mp3 file owned by the user or the corresponding user.

If one user selects another user and wants to send a message or mp3 file, the other user's IP information is used to connect directly to the selected user. Therefore, the user can exchange messages with the selected user or directly send necessary data without going through the Napster server. In other words, once a user using Napster program selects another user who wants to connect, he / she can establish a connection with them and then send message and data in real time. The Napster program can be found on Napster's Web site at www.napster.com.

Soribada is similar in function to the Napster program. When a user connected to the server is confirmed, the message transfer and data transfer between users who use the soridsea program are performed in real time. For more information on the Soribada program, please visit www.soribada.com.

3 is a diagram illustrating a process of transmitting a message and data through a service such as a Napster or a sound sea.

Referring to FIG. 3, the user's computer system 14 connects to the server 10 via the Internet. At this time, each computer system 14 can check the IP address and user information of another computer system connected to the server 10. Each computer system 14 can open a directory to read data held by itself, such as an mp3 file or an image file, in another computer system. Therefore, each computer system 14 checks the information of the other user and selects the computer system 14 to which the message or data is to be transmitted, and then uses the IP address of the selected computer system 14 without passing through the server 10. To connect directly. Once the connection is established between the computer systems 14, direct message and data transfers are made between the connected computer systems 14.

This method combines the client / server model and the peer-to-peer model. When the user connected to the server is confirmed, the method connects directly to the designated user and sends messages and data. Because this method uses IP addresses, the users who can use the service are restricted to users who use authorized IP addresses. Otherwise, if you use private IP addresses within a proxy server or LAN, Not available The private IP address is defined in REC 1918, and is an address block designated so that a user can freely use it locally. Specifically, IP addresses from 10. 0. 0. to 10. 255. 255. 255., IP addresses from 172. 16. 0. 0. to 172. 31. 255. 255. and 192.168. This includes three blocks containing IP addresses from 0 to 192.168.255.255.

At this time, in order to check the information of the other computer system 14 in a state where each computer system 14 is connected to the server 10, a session with the server 10 connected through the Internet must be maintained. . Through this, each computer system 14 can check whether the other computer system 14 is connected. In general, the server 10 allocates a memory capacity of 1 Mbyte to maintain a session with the connected computer system 14. As a result, as the number of computer systems 14 connected to the server 10 increases, the memory capacity used by the server 10 increases, and at the same time the server 10 in the case where many computer systems 14 connect. Will reduce the data processing speed.

The same is true for peer-to-peer connections that are directly connected within a LAN or a specific network without going through a server. Therefore, in the case of a computer system connected in a peer-to-peer manner, each computer system must open a session for connection with the other computer system in order to transmit data to each other. Therefore, as the number of members such as clients or servers forming a network for data transmission between each other increases, the overall load of the network increases and the data transmission speed decreases.

The present invention is to solve the above problems, to remotely call a computer system using Remote Method Invocation (hereinafter referred to as RMI), and to perform data communication while maintaining a session for the actual transmission period It is an object of the present invention to provide a dynamic communication method and system.

Another object of the present invention is to provide a dynamic communication method and system capable of controlling a connection with a called computer system according to a data transmission method in a process of calling a computer system remotely through an RMI.

1 is a schematic diagram of a typical client / server model.

2 is a block diagram of a Peer-to-Peer model.

FIG. 3 is a diagram illustrating a process of transmitting a message and data through a service such as Napster or Sound Sea.

4 is a block diagram of an RMIC packet for dynamic communication using a remote method call according to an exemplary embodiment of the present invention.

5 is a diagram illustrating a case in which a dynamic communication connection is established between peer-to-peer connectionable computer systems in a dynamic communication system using a remote method call according to an exemplary embodiment of the present invention.

FIG. 6 is a diagram illustrating a case in which a connection setting is released between computer systems in which a dynamic connection is made through a peer-to-peer in a dynamic communication system using a remote method call according to an exemplary embodiment of the present invention. FIG.

7 is a diagram illustrating a case where dynamic communication is performed through a server / client structure in a dynamic communication system using a remote method call according to an exemplary embodiment of the present invention.

8A to 8C are diagrams illustrating screens of a program for dynamic communication in a dynamic communication method using a remote method call according to an exemplary embodiment of the present invention.

(Name of the code for the main part of the drawing)

40: server system 42, 44: client system

In order to achieve the above object, in the dynamic communication method using the remote method call of the present invention, at least one of a communication method for data communication, a connection port, and connection setting data is attached to an RMI packet capable of calling a specified method. Generating a remote method invocation for communication (RMIC) packet, and transmitting the RMIC packet to a counterpart computer system to which a session is to be connected to perform data communication, thereby storing the stored method in the counterpart computer system receiving the RMIC packet. Calling a message, receiving a response signal for an RMIC packet from the counterpart computer system, connecting a session with the counterpart computer system in response to the response signal, and, in a session connection state, data in a designated communication method. It may include the step of transmitting.

The dynamic communication method using the remote method call may further include transmitting an RMIC packet for session release when data transmission is completed.

In addition, the dynamic communication method using a remote method call of the present invention is a method for performing data communication through a server system connecting a plurality of client systems, the IP of the other client system to access the server system, to perform data communication Receiving an address, generating an RMIC packet to which an RMI packet capable of invoking a specified method is attached, at least one of a communication method, a connection port, and connection setting data for data communication; Sending the RMIC packet to the counterpart client system to which the session is connected by using the received counterpart client system's IP address, calling a stored method inside the counterpart client system that has received the RMIC packet, and receiving the RMIC from the counterpart client system. Vs packet The method may include receiving a response signal, connecting a session with the counterpart client system in response to the response signal, and transmitting data through a designated communication method in a session connection state.

The step of accessing the server system and receiving an IP address of the counterpart client system to perform data communication may include at least one of a communication method, a connection port, and connection setting data for data communication, for an RMI packet capable of calling a specified method. Generating an RMIC packet to which one is attached, calling the stored method inside the server system that has received the RMIC packet by sending the RMIC packet to the server system using the IP address, and from the server system Receiving a response signal for the RMIC packet, connecting the session with the server system in response to the response signal, and receiving the IP address transmitted from the server system in the session connection state.

In addition, the dynamic communication method using the remote method call of the present invention, for a plurality of client systems connected via the network, the communication method for data communication, connection port and connection configuration data for the RMI packet that can call the specified method Receiving an RMIC packet to which at least one of the RMIC packets are attached, executing a specified method according to an RMI packet included in the RMIC packet, transmitting a response signal to a client system that has transmitted the RMIC packet; Connecting the session with the client system that transmitted the RMIC packet, and transmitting the selected data to the client system that transmitted the RMIC packet.

In addition, the dynamic communication system using a remote method call of the present invention generates an RMIC packet to which the RMI packet capable of invoking a specified method is attached, at least one of a communication method, a connection port, and connection setting data for data communication. An RMIC packet transmission unit for transmitting a RMIC packet to a counterpart computer system to which a session is to be connected to the RMIC packet generating unit and a counterpart computer system to which the session is connected, thereby calling a stored method in the counterpart computer system that has received the RMIC packet; A receiving unit for receiving a response signal to the RMIC packet from the other computer system, a session control unit for connecting a session with the other computer system in response to the response signal, and a data transmitting unit for transmitting data in a designated communication method in a session connection state It may include.

In addition, the dynamic communication system using the remote method call of the present invention, for a plurality of client systems connected via a network, the communication method, data connection port and connection configuration data for data communication for the RMI packet that can call the specified method A RMIC packet receiver for receiving an RMIC packet to which at least one is attached, a method execution unit for executing a specified method according to the RMI packet included in the RMIC packet, and a response signal and data to a client system that has transmitted the RMIC packet. The apparatus may include a signal transmitter for transmitting a signal and a session controller for connecting a session with a client system that has transmitted the RMIC packet.

In addition, the computer program product of the present invention is a recording medium that is tangibly embodied in a program of instructions that can be executed by a digital processing apparatus so as to perform dynamic communication using RMI, and can be read by the digital processing apparatus. A method for performing dynamic communication, the method comprising: generating an RMIC packet to which an RMI packet capable of calling a specified method is attached, at least one of a communication method, a connection port, and connection setting data for data communication; In order to perform data communication, calling the stored method inside the counterpart computer system that has received the RMIC packet by transmitting the RMIC packet to the counterpart computer system to which the session is to be connected; and responding to the RMIC packet from the counterpart computer system. Receiving a signal, and in response to the response signal, And connecting a session with the counterpart computer system, and transmitting data in a designated communication method in a session connection state.

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

The present invention uses Remote Method Invocation (RMI) to enable dynamic communication with remote computer systems. RMI uses the Java programming language and development environment to create object-oriented programs in which objects on different computer systems interact within a distributed network.

RMI is a Java version of what is commonly known as Remote Procedure Call (RPC), but has the ability to pass one or more objects with a request. The object may include information for changing a service performed in a remote computer system. An RMI request is a request that invokes a method on a remote object. This request has the same syntactic form as calling an object method that exists within the computer system. In general, RMI is designed to protect the object model and its benefits across the network.

Typically, RMI is implemented as three layers between a Stub / Skeleton layer, a Remote Reference layer, and a Transport layer between an application and a Java Virtual Machine. The stub / skeleton layer is responsible for stub programs on the client side and the corresponding organizational programs and interfaces on the server side in a client / server relationship. The Remote Reference layer controls the Remote Object according to the parameters passed by the calling program. The transport layer is responsible for actual network communication, and is mainly based on TCP / IP.

The present invention configures a Remote Method Invocation for Communication (RMIC) packet by attaching separate data to an RMI packet for dynamic communication that maintains a session only while communication is performed between computer systems connected through a network.

4 is a block diagram of an RMIC packet for dynamic communication using a remote method call according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the RMIC packet for dynamic communication according to the present invention includes an RMI packet capable of calling a remote method existing in a remote computer system connected through a network, and includes attached data for dynamic communication. do. The attached data may include at least one of a communication method in which a connection is established between remote computer systems, a connection port for opening for communication, and a connection establishment / release that indicates establishment or release of a dynamic connection.

The communication method is not limited to TCP / IP, and various communication methods such as UDP (User Datagram Protocol) or Multicast may be used according to the type of data to be transmitted. At this time, the computer system making the RMIC call operates as a server, and the computer system responding in response to the RMIC call performs the function of a client. Therefore, it is preferable that a computer system acting as a server can select a communication method according to the type of data to be transmitted or received.

The connection port is for specifying a port number for performing a connection for communication with a computer system acting as a client in a computer system acting as a server. Thus, the computer system sending the RMIC packet may instruct to specify a fixed port number or to select any port number that is not currently used for establishing a connection.

Connection establishment / release requests a connection for dynamic communication to a remote computer system that has not established a session, or requests to release session establishment for a remote computer system where dynamic communication is being made while the session is established. Part.

As such, the method of performing dynamic communication using the RMIC packet of the present invention may be performed between remote computer systems connected by peer-to-peer or between computer systems as clients connected thereto through a server. .

FIG. 5 is a diagram illustrating a case where a dynamic communication connection is established between computer systems that can be connected by peer-to-peer in a dynamic communication system using a remote method call according to an exemplary embodiment of the present invention.

Referring to FIG. 5, in the Peer-to-Peer connection state, the computer system 32 making an RMIC connection request operates as a server, and the computer system 34 receiving an RMIC connection request operates as a client. Can be.

Thus, computer system 32, acting as a server, selects computer system 34 to perform dynamic communication and sends RMIC packets to selected computer system 34 using identification information, such as an IP address, thereby providing an RMIC connection. Request (step 1). The computer system 34 receiving the RMIC packet determines the method called from the RMIC packet, the communication method indicating the connection method of the computer system 32 that sent the RMIC packet, the data indicating the connection port and the connection setting, Run the method (step 2). At this time, the RMIC packet will include data requesting connection establishment.

The computer system 34 acting as a client opens the designated connection port with the execution of the called method, and sends an RMIC response signal to the connection request to communicate with the computer system 32 acting as the server. (Step 3). Upon receiving the RMIC response signal from the computer system 34 acting as a client, the computer system 32 acting as a server executes a communication application (step 4), and a session for communication between the computer systems 32 and 34 is performed. The setting is made (step 5).

The session setup between the computer systems 32 and 34 connected to the peer-to-peer is maintained during the data transfer, and the session setup is canceled when the data transfer ends.

FIG. 6 is a diagram illustrating a case where a connection setting is released between computer systems in which a dynamic connection is made through a peer-to-peer in a dynamic communication system using a remote method call according to an exemplary embodiment of the present invention.

Referring to FIG. 6, in a state in which a session is established between computer systems 32 and 34 through an RMIC packet (step 11), when the data transmission is terminated, the computer system 32 operating as a server requests to disconnect. The RMIC packet is transmitted (step 12). At this time, since the session setup is made with the selected connection port and communication method, the RMIC packet transmitted when the session is requested to be disconnected is not included in the communication method and connection port, but is data indicating the RMI packet and the connection release. It could be done.

Receiving the RMIC packet, the computer system 34 extracts and executes the designated method (step 13), and transmits an RMIC response signal for disconnection to the computer system 32 operating as a server (step 14). Upon receiving the RMIC response signal, the computer system 32 releases the session (step 16) by terminating the communication application (step 15).

Meanwhile, in the dynamic communication method using the remote method call of the present invention, when connected by peer-to-peer, identification information of a computer system to communicate, such as an IP address, must be known in advance. However, in the case of constructing a server capable of collecting IP addresses of each computer system for a plurality of computer systems using the dynamic communication of the present invention, a computer system to perform dynamic communication may be selected.

FIG. 7 is a diagram illustrating a case where dynamic communication is performed through a server / client structure in a dynamic communication system using a remote method call according to an exemplary embodiment of the present invention.

Referring to FIG. 7, the dynamic communication system of the present invention comprises a plurality of client systems 42 and 44 and a server system 40 integrating and connecting the client systems 42 and 44 through a network. The server system 40 and each client system 42, 44 perform dynamic communication as shown in FIGS. 5 and 6. That is, the server system 40 and the client systems 42 and 44 perform an RMIC connection that maintains a session only while data transmission is made through the RMIC packet. Thus, server system 40 may have IP address information of client systems 42 and 44 making RMIC connections.

On the other hand, the client systems 42 and 44 may not have mutual IP information. At this time, for the RMIC connection from the first client system 42 to the second client system 44, IP information of the second client system 44 may be acquired through the server system 40. At this time, it will be apparent that the process of acquiring the IP information of the second client system 44 from the first client system 42 is also performed through the RMIC connection of the present invention.

Accordingly, the first client system 42 may connect the second client system 44 with the RMIC of the present invention by using the acquired IP information of the second client system 44. Here, since the dynamic communication of the present invention opens the session only for a period from the start of the data transmission to the end of the data transmission, the RMIC connection is shown in dotted lines in FIG.

As an example, the dynamic communication method using the remote method call of the present invention is applied to a messenger program that can communicate with computer systems.

Looking at the messenger program used so far, if a chat partner is selected and registered, the registered chat partner is displayed on one screen of the messenger program. At this time, the screen displays a status of whether the registered chat partner is connected to or not connected to the server system. If the contact is not connected to the server system, the conversation is not possible because the session connection with the corresponding party is not established.

However, if the dynamic communication method using the remote method call of the present invention is applied, it is possible to establish a session with the counterpart by using the RMI even when the counterpart to communicate with is not connected to the server system. Therefore, the client system only needs to connect to the server system when obtaining IP information of another client system or transmitting necessary data, and there is no need to maintain a session with the server system. As a result, even in a server system, there is no need to continuously maintain sessions with a large number of client systems, thereby reducing the load on the system and increasing the efficiency of data transmission. In addition, the client system also enables data transmission through a session connection as needed, regardless of whether the client system to be communicated with is connected to the server system.

8A to 8C illustrate screen examples of a program for dynamic communication in a dynamic communication method using a remote method call according to an exemplary embodiment of the present invention.

First, FIG. 8A illustrates a case where an administrator of a server system sets an IP address of a server system for a plurality of client systems when building a system in a server / client structure. At this time, the administrator of the server system can set not only the IP address of the server system but also information about each department and the position and manager of the members constituting the department.

8B is an exemplary view of a screen of a program capable of performing dynamic communication of the present invention in a client system. The client system may record information about an ID and password for accessing the server system, individual members and group members for RMIC connection, and the like.

8C is an exemplary view of inputting personal information of a user for dynamic communication in a program of a client system. There are entries for names, social security numbers, telephone numbers, addresses, company names, departments, titles, IDs, and passwords, but these personal information may vary.

The dynamic communication method using the remote method call of the present invention may be applied to Enterprise Resource Planning (ERP) and Customer Relationship Management (CRM) as necessary.

As described above, according to the dynamic communication method and system using the remote method call of the present invention, since the session connection is made only during the period of data transmission using the RMI, it is possible to reduce the load on the client system or the server system.

In addition, the dynamic communication method and system using the remote method call of the present invention can control the communication method according to the type of data to be transmitted, thereby maximizing the efficiency of data transmission in the session connection state.

In addition, the dynamic communication method and system using the remote method call of the present invention can be called for the session connection, if necessary, regardless of whether or not the chat partner is connected to the server system.

In particular, when using a program that performs a dynamic communication method using a remote method call of the present invention, it is possible to secure a minimum copper wire for data transmission between users, and to maintain high-speed data transmission and security. .

In the above, the dynamic communication method and system using the remote method call according to the present invention have been described in detail through a preferred embodiment, but the content is not limited to the field of the present invention described in the claims below. In addition, in the art, it will be apparent to those skilled in the art that various changes or modifications are made within the scope of the present invention.

Claims (10)

In the method of performing data communication using Remote Method Invocation (RMI), Generating a Remote Method Invocation for Communication (RMIC) packet to which an RMI packet capable of invoking a designated method is attached, at least one of a communication method, a connection port, and connection setting data for data communication; In order to perform data communication, calling the stored method inside the counterpart computer system that has received the RMIC packet by transmitting the RMIC packet to the counterpart computer system to which the session is to be connected; Receiving a response signal for an RMIC packet from the counterpart computer system; In response to the response signal, connecting a session with a counterpart computer system; And In a session connection state, transmitting data in a specified communication method Dynamic communication method using a remote method call comprising a. The method of claim 1, When the data transmission is completed, transmitting an RMIC packet for session release Dynamic communication method using a remote method call further comprising. In the method for performing data communication using RMI through a server system connecting a plurality of client systems, Accessing a server system and receiving an IP address of a counterpart client system to perform data communication; Generating, for a RMI packet capable of invoking a designated method, an RMIC packet to which at least one of a communication method, a connection port, and connection setting data for data communication is attached; Calling the stored method inside the counterpart client system that has received the RMIC packet by transmitting the RMIC packet to the counterpart client system to which the session is to be connected using the IP address of the counterpart client system provided from the server system; Receiving a response signal for an RMIC packet from the counterpart client system; In response to the response signal, establishing a session with a counterpart client system; And In a session connection state, transmitting data in a specified communication method Dynamic communication method using a remote method call comprising a. The method of claim 3, Accessing the server system and receiving an IP address of the other client system to perform data communication Generating, for a RMI packet capable of invoking a designated method, an RMIC packet to which at least one of a communication method, a connection port, and connection setting data for data communication is attached; Calling an stored method inside the server system that has received the RMIC packet by sending an RMIC packet to the server system using an IP address; Receiving a response signal for an RMIC packet from the server system; In response to the response signal, connecting a session with a server system; And In a session connection state, receiving an IP address sent from a server system Dynamic communication method using a remote method call comprising a. In the method for performing data communication using a RMI for a plurality of client systems connected via a network, Receiving, for an RMI packet capable of invoking a specified method, an RMIC packet to which at least one of a communication method, a connection port, and connection setting data for data communication is attached; Executing a specified method according to an RMI packet included in the RMIC packet; Transmitting a response signal to a client system that has transmitted the RMIC packet; Connecting a session with a client system that transmitted the RMIC packet; And Transmitting the selected data to the client system that transmitted the RMIC packet; Dynamic communication method using a remote method call comprising a. In a system for performing data communication using RMI, An RMIC packet generation unit for generating an RMIC packet to which an RMI packet capable of invoking a designated method is attached, at least one of a communication method, a connection port, and connection setting data for data communication; In order to perform data communication, by sending the RMIC packet to the counterpart computer system to which the session is to be connected, an RMIC packet transmitter for calling a stored method inside the counterpart computer system that has received the RMIC packet; A receiving unit for receiving a response signal to the RMIC packet from the counterpart computer system; A session controller for connecting a session with a counterpart computer system in response to the response signal; And Data transmission unit for transmitting data in the specified communication method in the session connection state Dynamic communication system using a remote method call comprising a. In a system for performing data communication using a RMI for a plurality of client systems connected via a network, An RMIC packet receiving unit for receiving an RMIC packet to which an RMI packet capable of invoking a designated method is attached, at least one of a communication method, a connection port, and connection setting data for data communication; A method execution unit that executes a specified method according to an RMI packet included in the RMIC packet; A signal transmitter for transmitting a response signal and a data signal to a client system that has transmitted the RMIC packet; And Session control unit for connecting the session with the client system that transmitted the RMIC packet Dynamic communication system using a remote method call comprising a. In a computer program product that is tangibly embodied in a program of instructions that can be executed by a digital processing device to perform dynamic communication using RMI, and which can be read by the digital processing device, The method of performing the dynamic communication, Generating, for a RMI packet capable of invoking a designated method, an RMIC packet to which at least one of a communication method, a connection port, and connection setting data for data communication is attached; In order to perform data communication, calling the stored method inside the counterpart computer system that has received the RMIC packet by transmitting the RMIC packet to the counterpart computer system to which the session is to be connected; Receiving a response signal for an RMIC packet from the counterpart computer system; In response to the response signal, connecting a session with a counterpart computer system; And In a session connection state, transmitting data in a specified communication method Computer program product comprising a. In order to perform dynamic communication using RMI for a server system connecting a plurality of client systems, a program of instructions that can be executed by the digital processing apparatus is tangibly implemented and can be read by the digital processing apparatus. In a computer program product, The method of performing the dynamic communication, Accessing a server system and receiving an IP address of a counterpart client system to perform data communication; Generating, for a RMI packet capable of invoking a designated method, an RMIC packet to which at least one of a communication method, a connection port, and connection setting data for data communication is attached; Calling the stored method inside the counterpart client system that has received the RMIC packet by transmitting the RMIC packet to the counterpart client system to which the session is to be connected using the IP address of the counterpart client system provided from the server system; Receiving a response signal for an RMIC packet from the counterpart client system; In response to the response signal, establishing a session with a counterpart client system; And In a session connection state, transmitting data in a specified communication method Computer program product comprising a. For a plurality of client systems connected through a network, programs of instructions executable by the digital processing apparatus are tangibly implemented to be capable of performing dynamic communication using RMI, and can be read by the digital processing apparatus. In a computer program product, The method of performing the dynamic communication, Receiving, for an RMI packet capable of invoking a specified method, an RMIC packet to which at least one of a communication method, a connection port, and connection setting data for data communication is attached; Executing a specified method according to an RMI packet included in the RMIC packet; Transmitting a response signal to a client system that has transmitted the RMIC packet; Connecting a session with a client system that transmitted the RMIC packet; And Transmitting the selected data to the client system that transmitted the RMIC packet; Computer program product comprising a.