Communication terminal device, telephone unit, system and method to notify caller information, as well as the corresponding programm and storage medium

摘要

A telephone unit (1) capable of checking a caller information even upon incoming call from a caller not registered on a telephone directory of the telephone unit, can be provided. Upon receipt of incoming call notice of a voice call, a voice communication portion (11) obtains a telephone number of the caller from incoming call information by a caller number obtaining portion (12). The telephone number obtained by the caller number obtaining portion is fed to the caller retrieving portion (13). When the caller information cannot be found, the caller retrieving portion feeds the telephone number to a data communication portion (15) to transmit a caller information retrieval request including the telephone number of the caller to a caller information retrieving system connected to internet from the data communication portion (15). A display portion (16) displays the telephone information and the caller information obtained from the caller retrieving portion (13) or the data communication portion (15). <IMAGE>