To prevent drop in frequency use efficiency and transmission efficiency even when level fluctuation respectively independent for every carrier wave is received by the influence of fading, etc., due to multi-path in radio communication by combining a multi-carrier modulation system and a CDMA system.

In dividing parts 104a1 to 104ak, transmission levels of signals to be allocated to each of the carrier waves #1 to #k are divided by reception levels detected by reception level detecting parts 111a1 to 111ak. Thus, the transmission level of the carrier wave with lower reception level preliminarily becomes higher and on the contrary, the transmission level of the carrier wave with higher reception level preliminarily becomes lower. Thus, level control to show opposite characteristics to line characteristics of a transmission line is preliminarily performed by every carrier wave before transmission of the respective carrier waves by using the reception levels.