PURPOSE: To surely prevent dialing mistake by displaying a registration telephone number close to an input telephone number onto a display section when the telephone number is inputted and selecting an opposite telephone number with the displayed registration telephone number so as to apply dialing processing.

CONSTITUTION: A telephone number entered from an operation section 7 and a registration telephone number stored in a RAM built in a system control section 13 are fed to a display section 3 via a display control section 17a and displayed. The collation is executed from the input of the 1st digit of the telephone number and the telephone number displayed on the display section 3 is displayed enough as the telephone number is sequentially entered and the telephone number of the opposite party is almost checked in the stage of the entrance up to the local station number. When the registration telephone number desired to be dialed is found out, a cursor 8 is moved up to the position of the registration telephone number to be selected. Then a re-transmission key 6 is depressed. Then the telephone line is connected to the opposite party of the selected telephone number.