| 摘要 |
A mobile station (10) includes: an SMS information acquisition unit (21) for acquiring an SMS (registration request) including a group conversation identifier for identifying a group conversation via a line exchange (NW 300); a memory (19) for storing a group conversation identifier contained in the SMS (registration request) as an arrival history; and a halfway participation process unit (25b) for receiving a call operation to a group conversation corresponding to the group conversation identifier stored as an arrival history, acquires the group conversation identifier correlated to the group conversation which has received the call operation from the storage unit, and generating an INVITE (halfway participation) containing the acquired group conversation identifier. |
