A wireless communication system that performs wireless communication between a master device and a slave device is configured to detect characteristic data indicating communication quality in the performed wireless communication, delete the communication channel which is determined not to satisfy a predetermined communication quality standard, determine whether a total number of the plurality of communication channels used for the wireless communication is smaller than a minimum limit value, and change the plurality of communication channels used for the wireless communication to the plurality of communication channels that satisfies a relaxed communication quality standard.