Patent ID: 7277530

Claim:
An IP telephone apparatus having a plurality of types of calling functions including a telephone calling function for telecommunicating via a telephone network and a network calling function for telecommunicating via a computer network, the IP telephone apparatus comprising: a main unit that includes: a slave connection unit; a calling function detection unit configured to detect which calling function of the telephone calling function and the network calling function is selected; and a first calling function notification unit that notifies a user that at least one of a general telephone using the telephone calling function and a network telephone using the network calling function is in operation according to a detection result of the calling function detection unit; and a slave that communicates with the main unit by radio communication via the slave connection unit, the slave including: a voice input/output unit; and a second calling function notification unit that notifies a user that at least one of the general telephone using the telephone calling function and the network telephone using the network calling function is in operation according to a detection result of the calling function detection unit.