In the example in FIG. 10C, the relation between the source node and destination node is many-to-one (two-to-one in FIG. 10C). That is, the relay station 100 first receives data D1 from a source node TxA by using the first modulation and/or multiplexing method or the second modulation and/or multiplexing method. The relay station 100 also receives data D2 from a source node TxB by using the first modulation and/or multiplexing method or the second modulation and/or multiplexing method. It is assumed here that the destination of the data D1 and that of the data D2 are both a destination node RxA. It is also assumed, for example, that link quality between the relay station 100 and the destination node RxA is better than that between the source node TxA or TxB and the relay station 100. Then, the relay station 100 modulates the data D1 and the data D2 into common symbols by using a higher-order modulation method and transmits the common symbols to the destination node RxA by using the first modulation and/or multiplexing method or the second modulation and/or multiplexing method.
(Selection Processing)
