To prevent call back transmission to an incoming call abusing a call register function.

A call setup signal and a release (REL) signal to be transmitted from the other terminal are detected, the time from detection of the call setup signal to detection of the release (REL) signal is counted as a call incoming time, telephone number data of the other terminal is stored as a call history, when the call incoming time is less than the prescribed time and the telephone number data of the other terminal is not registered in a prescribed storage means, control is performed so as not to store the telephone number data of the other terminal as the call history(steps S12, S14). Thus, a user's call back to a malicious caller is prevented by referring to the call history.