To surely radio communicate between a radio master unit and a radio slave unit of a radio communication apparatus used for an image forming device management system.

When the radio master station 100 and the radio slave station 101 of the radio communication apparatus have test start requests by the operations of the switches of the own stations, a carrier sense is sequentially performed for a frequency (inspecting frequency) having possibility of affecting an influence to the radio communication except the carrier frequency of CH (radio channel) to be used. When the inspecting frequency exceeding a predetermined value at the carrier sense level is detected, the CH corresponding to the inspecting frequency is decided as a noise mixing channel mixed with a noise for affecting the influence to the radio communication, and the use of the CH decided as the noise mixing channel is inhibited.