To identify respective locations where a plurality of users stand.

If a user stands on any of electrodes 3-1 to 3-4 and touches a screen 1, an induced voltage corresponding to a driving pulse is induced at wire electrodes 1Xi, 1Yj corresponding to the touched location, the induced voltage is detected with an X electrode detection part 11 and a Y electrode detection part 12, and the corresponding digital data are outputted to a data buffer/232C converter 37. The data buffer/232C converter 37, during a period when a control signal is on a high level, at the timing of rising edge of sampling pulse, samples the outputs of the X electrode detection part 11 and the Y electrode detection part 12. Specifically, because out-of-phase driving pulses are impressed to the electrodes 3-1 to 3-4, the timings of the sampling vary, which makes it possible to easily identify the locations of the electrodes where the user stands.