To enable a telephone call among multiple persons to be performed by using an IP telephone or an Internet telephone in a network game.

A sound reception unit of a terminal of network game includes a game communication unit 51 networked to a game server, a participant IP managing unit 53 for managing an IP address of a participant of an in on-line game, a network reception unit 54 for receiving speech data and musical data via a network, a distribution unit 55 for determining whether the received speech data has a predetermined IP address or not and for transmitting it to the next extension unit 56, an extension unit 56 for restoring the transmitted speech data and the musical data, a combining unit 57 for temporally combining the restored speech data and the musical data, and a microphone speaker I/F unit 59 which is a connection unit with a microphone speaker 14.