PURPOSE: To make correct automatic dialing regardless of the type of a line wire acquired by checking the acquired line wire and a dial number registered as an automatic dial and transmitting the dial number as necessary while processing the dial number when the line wire calling by automatic dialing is made.

CONSTITUTION: A main control 11 controls each par of a main unit 106 to perform the operations as shown below. When a telephone equipment 118a execute a line wire acquisition operation, whether or not the acquired line wire is on a digital pubic line 103 is discriminated and when the line wire is on the digital public line 103, call is made by manual and automatic dialings. When the acquired line wire is not on the digital public line 103 and when the fact that the line wire is at a point S of a PBXl02 and made by automatic dialing is discriminated, the main control 111 transfers to a line wire call processing at the time of the completion of dialing. At this time, when the fact that automatic dialing is made at the point S is discriminated, the call operation is executed while adding a trunk access code before the dial number registered in the automatic dial and the main control then transfers to a line wire call state. Thus, correct automatic dialing can be performed regardless of the type of the acquired line wire.