In response to an input unit inputting a request for communication, a room ID generation generates a room ID in accordance with presence information detected of a mobile phone, and transmits to a server device a request including the generated room ID for establishing a room. When a presence monitoring unit detects that the status of the mobile phone has changed from that obtained when the input unit input the request for communication, a room deletion request unit transmits to the server device a request including the generated room ID for deleting a room.