In a radio communication method such as W-CDMA, additive information of each current frame transmitted and received between a group of base stations 2, 4 and 6 and a mobile station 8 is added to a preceding frame precedent to the current frame by one frame and is sent before the current frame. On a receiving end, demodulation characteristics for the current frame corresponding to the additive information, which is added to the preceding frame and is sent before the current frame, is controlled and adjusted in advance according to the additive information, the current frame sent at a next time is demodulated according to the demodulation characteristics controlled and adjusted, and communication quality of frames transmitted and received between the group of base stations 2, 4 and 6 and the mobile station 8 is improved.