Encoding / decoding method and apparatus of the multi-channel signal

The invention further parameters using the parameters to be, to restore the down-mixed signal representing the multi-channel signal, and restoring the parameter indicative of the characteristic relationship between the channels of the multichannel signal, restored according to the decoding method of the multi-channel signal the estimate and to recover the multi-channel signal by mixing the restored using the restoration parameter, and the estimated parameter of the up-down-mix signal.