In a wireless communication system, transmitters that transmit data, receivers that receive data, and repeaters that relay data communicate with one another in a wireless manner. The transmitter wirelessly communicates with the receiver by using first slave-device identification information for performing communication as a slave device of the receiver. The receiver wirelessly communicates with the transmitter by using first master-device identification information for performing communication as a master device of the transmitter, and wirelessly communicates with the repeater by using second slave-device identification information for performing communication as a slave device of the repeater. The repeater wirelessly communicates with the receiver by using second master-device identification information for performing communication as a master device of the receiver.