According to one embodiment, a communication repeater system includes a master station device and radio frequency units which convert a signal from each of base station systems into an optical digital signal for transmission to the master station device. The base station systems establish communication by time division duplex scheme. The communication repeater system repeats communication between a mobile communication terminal device and each base station system via a corresponding one of slave station devices. A setter sets, as reference transmission/reception switching timing, a transmission/reception switching timing between the master station device and one of the radio frequency units corresponding to one of the base station systems which is first connected to the communication repeater system. A corrector corrects variation in the transmission/reception switching timing in accordance with the reference transmission/reception switching timing.