The present invention realizes a telephone system which enables calling with ease from an outside line to a desired extension telephone terminal in an extension telephone network having a plurality of representative numbers. The telephone control device connected to a plurality of telephone terminals and a plurality of telephone exchange devices, includes a designation accepting unit which accepts designation of a calling destination telephone number from a telephone terminal, a connection setting unit which selects a telephone exchange device from the plurality of telephone exchange devices based on a calling destination telephone number accepted by the designation accepting unit to execute connection setting at the selected telephone exchange device so as to connect a call from a telephone terminal which designates the calling destination telephone number to the calling destination telephone number, and a telephone number information transmission unit which transmits telephone number information of a telephone exchange device selected by the connection setting unit to a telephone terminal which designates a calling destination telephone number.