Communication is performed by selecting any one of or two or more paths from among multiple paths existing between a communication apparatus and the other party in communication. In addition to measuring an effective rate itself, the effective rate is estimated from a combination of Phy rate, received power, Phy rate, and statistics information. Then, on the basis of information about the effective rate of each path, a path used for data transmission is selected according to a single selection method for selecting a single path or a multi-selection method for selecting multiple paths at a time. The single selection method can be classified into a method for each session or a physically exclusive method. The multi-selection method includes weighting method and redundancy degree attaching method.