PURPOSE: To efficiently use a wireless circuit by rearranging channels when prescribed conditions are satisfied in the case where a new call is generated in a multicarrier hopping TDMA system.

CONSTITUTION: When the calls are generated from respective slave stations 21∼2L and channel allocating requests are received, a control station 1 decides channel positions (a carrier (f) and a time unit (t)) to the calls. The channel allocation is executed in a way mentioned below. Namely, in the case where the total number of the transmitting channels of the slave stations at a transmitting side and total number of the receiving channels of the slave stations at a receiving side of the above-mentioned new call in respective time units are equal to the permissible number of the channels or below even at the time of allocating an unoccupied channel to the new call to request the channel, even when the other respective slave stations use any of the channels, respective channels in the middle of communications are rearranged.