Abstract: A communication terminal device for enabling the terminal holder to at least acknowledge that there is a possibility that user data may be changed without receiving a change notification from a user when the user data is changed is provided. A communication terminal device 10 for conducting communications with a line user of a communication network 120 through the communication network 120 has a telephone directory management section 17 for managing personal information having identification information for identifying the line user and a contact address where to make contact with the line user; a most recent use date and time management section 18 for managing the most recent use date and time indicating the most recent date and time at which the personal information is updated or used; and a control section 16 for acknowledging that there is a possibility that the personal information may be changed if the most recent use date and time is earlier than a predetermined date and time.

Abstract: It is a problem of the invention to provide a telephone device in which only a terminal possessed by a user who wishes to identify a call partner is provided with a function of identifying the call partner, whereby the call partner can be always identified without troubling the call partner, and without making the call partner conscious of the judgment. The telephone device of the invention comprises: a storing section 18 which stores a voice of each of speakers; a speaker verifying section 15 which verifies the voice of each of speakers with a voice of a call partner; and a user notifying section 19 which notifies of the speaker who coincides with the voice of the call partner by the speaker verifying section 15.