To facilitate registration/edit of memory dial data by communication terminals of the conventional cordless phone.

In the cordless phone provided with a master unit and a slave unit, the master unit and the slave unit are characterized in to comprise; first storage means (AM1, AM2, AM3) storing telephone directory data; a first data transmission means 21 for transmitting data to the master unit or the slave unit being other unit than its own unit; a data adding means 24; a first data reception means 21 for receiving data sent from the other unit; a second storage means (BM1, BM2, BM3) storing the telephone directory data; a second data reception means 5 receiving data sent from the other unit; a data extract means 7; a second data transmission means 5 transmitting data to the master unit or the slave unit being the other unit than its own unit; and a control means for controlling the means.