Abstract: A communication terminal device of the present invention having a storage unit with an address book where a name information for specifying a communication partner, an identification number, and characteristic information of voice, are associated with one another, so as to allow bi-directional communication using voice, and having a recording unit for recording a voice of the communication partner when outgoing call is transmitted or incoming call is received if the identification number of the communication partner at a outgoing destination or a outgoing source is not included in the address book, an analysis unit for extracting the characteristic information from the voice recorded by the recording unit, and a registration unit for updating the address book by associating the identification number of the communication partner with the characteristic information included in the address book if the characteristic information extracted by the analysis unit is included in the address book.

Abstract: A communication terminal device of the present invention having a storage unit with an address book where a name information for specifying a communication partner, an identification number, and characteristic information of voice, are associated with one another, so as to allow bi-directional communication using voice, and having a recording unit for recording a voice of the communication partner when outgoing call is transmitted or incoming call is received if the identification number of the communication partner at a outgoing destination or a outgoing source is not included in the address book, an analysis unit for extracting the characteristic information from the voice recorded by the recording unit, and a registration unit for updating the address book by associating the identification number of the communication partner with the characteristic information included in the address book if the characteristic information extracted by the analysis unit is included in the address book.