A control apparatus 13 outputs an order signal to order supply apparatuses 12-1 through 12-N to perform supply of a signal in a contactless manner at a respectively different timing. The control apparatus 13 determines that a moving apparatus 11 is stopped at the position of the supply apparatus 12 being the output destination of the signal output order, when a wireless signal is received from the moving apparatus 11 within a certain period of time after outputting the order signal. Then, the supply apparatus 12 at the position at which the moving apparatus 11 is ordered to start supplying a signal.