PURPOSE: To attain a telephone call automatically only with key depression, by energizing sequentially a solenoid in contact with a pushbutton by an output of a processing circuit and a memory storing telephone number of an opposite party.

CONSTITUTION: When a selected key 5 is depressed, the information is inputted to a processor via a lead of a lead board 4, a telephone number is extracted from an RAM and transmitted to an output side while counting the timing. The electric signal energized at the output side is applied to the solenoid 2, and pushbuttons of a telephone set 6 is depressed sequentially by the absorbing force. When the change of telephone number is desired, the number is stored in the RAM by depressing the button of the solenoid 2 in the order of the telephone number of the opposite party while depressing the key 5 of the opposite number.