Communication system, communication terminal, server, communication method to be used therein and program therefor

A communication terminal for receiving data from a sending side through a server and a network, and sending the data to a receiving side through said server and said network, comprising:

• holding unit which holds presence information representing the state information of the terminal and a user, and unit which modifies the operation of said terminal and performing send/receive data processing when the presence information held in said holding unit meets a specific condition.

A server for receiving data from a communication terminal on the sending side through a network, and delivering the data to a communication terminal on the receiving side through the network, comprising

• linking unit which uses the presence information held in holding unit of said communication terminal and representing the state information of said communication terminal and a user to create a group of terminals that perform communication.

A communication method used in a communication system in which a server receives data from a communication terminal on the sending side through a network, and delivers the data to a communication terminal on the receiving side through said network, comprising said communication terminal performing the steps of:

• holding presence information representing the state information of said communication terminal and a user in holding unit, and modifying the operation of said communication terminal and performing send/receive data processing when the presence information held in said holding unit meets a specific condition.

A program for a communication method used in a communication system in which a server receives data from a communication terminal on the sending side through a network, and delivers the data to a communication terminal on the receiving side through the network, making a computer on said communication terminal side perform the functions of:

• holding presence information representing the state information of said communication terminal and a user in holding unit, and modifying the operation of said communication terminal and performing send/receive data processing when the presence information held in said holding unit meets a specific condition.