To inexpensively accomplish a SFN (Single Frequency Network) without using any expensive device such as a GPS.

A plurality of base stations having network addresses comprise a master base station and slave base stations, wherein the master base station includes a base station information transmitting unit for transmitting a network address of the master base station via a radio, each slave base station includes a base station information receiving unit for receiving the network address transmitted from the master base station via radio, and the plurality of base stations are capable of communicating with one another via a wired network using the network addresses. The master base station then includes a synchronizing signal transmitting unit for transmitting a synchronizing signal via radio, each slave base station includes a synchronizing signal receiving timing measuring unit for receiving the synchronizing signal transmitted by the master base station and measuring a receiving timing of the synchronizing signal, and synchronizing timing to synchronize the base station to the wired network is determined based on a result of measuring the synchronizing signal receiving timing.