Patent ID: 8417768

Claim:
A communication terminal configured to communicate with one or more other communication terminals via a communication network and a server device, comprising: a presence detection unit configured to detect a status of the communication terminal; a communication request unit configured to input a request for communication, via a room established in said server device for communicating data with said one or more other communication terminals; an identification generation unit configured to generate room identification data based on the status detected by said presence detection unit for identifying said room; a room establishment request unit operative in response to said communication request unit inputting said request for communication, for transmitting to said server device an establishment request including said room identification data generated by said identification generation unit for establishing said room; a presence variation detection unit configured to detect that a current status of the communication terminal detected by said presence detection unit has changed from a status that said presence detection unit detected when said communication request unit input said request for communication; and a room deletion request unit configured to transmit a deletion request including said room identification data generated by said identification generation unit to said server device for deleting said room when said presence variation detection unit has detected that the status of the communication terminal has changed.