A method and apparatus is provided for calculating possible values of a combination ratio for signals received via a plurality of antennas (A1 to An) according to different algorithms by means of a plurality of algorithm units (31 to 33), calculating an SIR value for each of a plurality of composite signals which are generated using the possible values, respectively (SIR calculation units (41 to 43)), determining which composite signal has the highest quality (determining unit (44)), and selecting the composite signal having the highest quality as a received signal (selecting unit (45)). Thus, since one composite signal with the highest quality is selected as the received signal from among the plurality of composite signals acquired according to the different algorithms, when the weight calculation according to either of the different algorithms becomes unstable or results in an erroneous convergence, the composite signal according to this algorithm is not selected and another composite signal according to another algorithm is selected. Accordingly, the weight calculation can be maintained with stability, and erroneous convergences of weights can be prevented.