A base station synchronization system, a synchronization controller, and a base station are provided that are capable of establishing precise synchronization among a plurality of base stations. In a base station synchronization system including a plurality of base stations and a base station concentrator, the base station concentrator includes a control information generator for generating synchronization control information, and each base station includes a VCO oscillating at a frequency corresponding to an input control voltage, and a corrector for correcting the input control voltage to the VCO according to the synchronization control information. This configuration makes it possible to establish synchronization among the master clocks of the plurality of base stations so as to suppress phase differences among the base stations and precisely synchronize the base stations with each other.