| 摘要 |
A user invited to a session can see the content of the conversation exchanged in the session before participating in the session, so that he/she can easily decide whether or not to join the session. There are provided an invitation request transmitting section 202 which transmits an invitation request to invite another station user to a communication session, an invitation acceptance transmitting section 206 which transmits an invitation acceptance response according to an input operation of a user of its own station when an invitation request is received from another station, a digest request transmitting section 206 which transmits a digest request when predetermined conditions are satisfied for the invitation request received from another station, a digest information transmitting section 210 which creates and transmits the digest information when the digest request from another station is received, and a digest information output section 213 which notifies the user of its own station of the content of the digest information received from another station.
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