A channel estimation and prediction unit 18 estimates a channel and predicts a plurality of channels for a next transmission slot. An SVD unit 19 performs singular value decomposition on a plurality of channel prediction values. An eigenvalue calculation unit 20 calculates a plurality of eigenvalues in a slot, whereas an eigenmode quality calculation unit 21 calculates a single quality for each eigenmode, considering variation frequency of the eigenvalue in the slot and outputs the quality to a transmission adaptive control unit 22.