Abstract: When a chat service initiation request arrives from a user terminal, the most suitable communication modality is determined based on registration information stored in memory and the message transmitted from the user terminal is converted to this communication modality and then transmitted to the remote party. In principle, if the destination party is a registered member, the chat modality is selected as the communication modality employed when communicating with the remote destination party. On the other hand, if the destination party is an unregistered member, a modality is selected that corresponds to the information registered in memory in association with the unregistered member.

Abstract: A server device receives a request to start a game playable on the chat from the terminal of a chat participating user, asks other chat participating users participating in the chat for their wish to participate in the game requested to start, accepts participation of a chat participating user responding to the inquiry about the participation as a game participating user, and starts the game on the chat. The server device receives an instruction for a progress of the game from the terminal of a game participating user, and displays an image corresponding to the received instruction on the chat screen.