To adjust the delay quantity of radio waves radiated from a plurality of slave stations and to prevent the lack and the overlap of data even if a reception terminal moves for a plurality of antennas.

Pulse modulation signals are transmitted from a master station 111 to the respective slave stations 131 to 13N and they are radiated from the transmission antennas 151 to 15N of the respective slave stations. In the respective slave stations, detection parts 232 detect the pulse modulation signals radiated from the self-stations and the pulse modulation signals radiated from the adjacent stations. Control parts 233 compare the arrival time of pulses and control the delay quantity of delay parts 234. Thus, the difference of the delay quantities of the respective slave stations 131 to 13N can be corrected.