To impartially make a peripheral radio communication device access to other ones while avoiding the collisions of data at a data reception time when accesses are concentrated when a radio communication is conducted by a network such as an autonomous-dispersion "ad hoc" network.

A beacon-cycle information is added to a beacon signal transmitted from the radio communication device and transmitted, and a backoff time is set by the peripheral radio communication device on the basis of the beacon-cycle information. When there is the data transmitted to the corresponding radio communication device from the peripheral one, the collisions with data transmissions from other ones can be prevented so that the data begin to be transmitted after the backoff time passes.