PURPOSE: To easily register a telephone number and to attain automatic transmission by automatically registering the telephone number, which is newly used at the time of calling, updating a calling number concerning a telephone number, which is already registers, displaying and selecting the telephone number in the order of a high using frequency at the time of the calling.

CONSTITUTION: A storing means 2 stores the registered telephone number and the calling number of the number and a registering means 3 refers the storing means 2 each time the calling is executed by a calling means 1. Then, the registration of the new telephone number and the updating of the calling number are executed, stored to the storing means 2 and registered. The telephone number is read out of the storing means 2 in the order of the large calling number by a reading means 4 and displayed to a display means 6. The displayed telephone number is selected by a selecting means 5 and outputted to the calling means 1 and the calling means 1 executes the calling based on the telephone number which is selected by the selecting means 5. Accordingly, the telephone number is automatically registered and selected out of the telephone numbers, which are displayed in the order of the high using frequency. Thus, communication can be executed and the telephone number can be easily registered and automatically transmitted.