A wireless tag reader/writer control system includes a control apparatus for controlling a plurality of wireless tag readers/writers transmitting a signal to and receiving a signal from a wireless tag by transmitting an electromagnetic wave radiation execution timing arrangement including the time span authorized to radiate an electric wave at a time and the radiation time intervals between radiations of electric wave to each of the wireless tag readers/writers and a plurality of wireless tag readers/writers, each having a reader/writer main body for transmitting a signal to and receiving a signal from a wireless tag and receiving the execution of radiation time intervals between radiations of electric wave from the control apparatus. The control apparatus is adapted to transmit the execution of radiation time intervals between radiations of electromagnetic wave to each of the wireless tag readers/writers and each of the wireless tag readers/writers is adapted to radiate an electromagnetic wave according to the received execution of radiation time intervals.