Importance

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Abstract

A chat system includes a key telephone unit and a plurality of user terminals connected to the key telephone unit. When the key telephone unit receives presence information including an IP address of the user terminal, it refers to a list in a list table, selects the received IP address in presence information, and transmits the presence information including the IP address to a recipient included in the list. Thus, the key telephone unit establishes peer-to-peer chat communication between the user terminal that has transmitted the IP address and the recipient. When the user terminal which is continuing a chat moves to a different user terminal, the chat is being continued by transmitting presence information including an IP address of the different user terminal to the key telephone unit and chat data are transferred between the user terminal and the different user terminal in a peer-to-peer connection.

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First Claim