To enable the synchronous correction of systems by using a reference clock supplied from a wired transmission line and a system frame signal in order to attain the synchronization of plural base stations, receiving a frame synchronizing signal transmitted from another base station and calculating the delay of the synchronizing signal from that frame signal corresponding to the reference clock mentioned above.

A reference clock CLK and a system frame signal SYS-FS of 8kHz are inputted from a wired transmission line 14 of a high-speed digital communication network while using a synchronizing corrector composed of an antenna, RF part 13, radio control part 10, differential calculation logic 11 and delay logic 12. On the other hand, a radio frame synchronizing signal FSYNC (A) of another base station under transmission is inputted from the radio control part 10, delay time Td of the radio frame synchronizing signal FSYNC (A) from the system frame signal SYS-FS is calculated by the differential calculation logic 11, the delay of the system frame signal SYS-FS is corrected by the delay logic 12, and a frame synchronizing signal FSYNC is obtained.