A method for generating a stereo signal from a down-mixed mono signal according to a channel configuration in a decoding terminal, the method, comprising: receiving, from a bitstream, spatial information including channel level differences, CLDs, and Inter-Channel Correlations, ICCs, each of the CLDs being an energy difference between predetermined channels of a multi-channel signal according to an 5.1 MPEG surround specification, with regard to a time/frequency tile of the down-mixed mono signal, and each of the ICCs being information about correlation or coherence between the predetermined channels of the multi-channel signal, with regard to the time/frequency tile of the down-mixed mono signal, the spatial information being generated when the multi-channel signal is down-mixed into the down-mixed mono signal, wherein the received spatial information is used for up-mixing the down-mixed mono signal into the multi-channel signal other than the stereo signal; determining whether a decoding level, dl, indicating the channel configuration in the decoding terminal is a stereo channel; when the decoding level, dl, is the stereo channel, calculating spatial information including a channel level difference, CLD', and an Inter-Channel Correlation, ICC', wherein the CLD' and the ICC' correspond to a single one-to-two, OTT, module for the stereo signal, using the received spatial information, wherein the calculated channel level difference, CLD', indicates an energy difference between a left channel and a right channel, which are included in the stereo signal, and the calculated Inter-Channel Correlation, ICC', indicates a correlation or coherence between the left channel and the right channel of the stereo signal; and up-mixing the down-mixed mono signal to the stereo signal including the left channel and the right channel, using the calculated spatial information and the single one-to-two, OTT, module for the stereo signal to generate the stereo signal. receiving, from a bitstream, spatial information including channel level differences, CLDs, and Inter-Channel Correlations, ICCs, each of the CLDs being an energy difference between predetermined channels of a multi-channel signal according to an 5.1 MPEG surround specification, with regard to a time/frequency tile of the down-mixed mono signal, and each of the ICCs being information about correlation or coherence between the predetermined channels of the multi-channel signal, with regard to the time/frequency tile of the down-mixed mono signal, the spatial information being generated when the multi-channel signal is down-mixed into the down-mixed mono signal, wherein the received spatial information is used for up-mixing the down-mixed mono signal into the multi-channel signal other than the stereo signal; determining whether a decoding level, dl, indicating the channel configuration in the decoding terminal is a stereo channel; when the decoding level, dl, is the stereo channel, calculating spatial information including a channel level difference, CLD', and an Inter-Channel Correlation, ICC', wherein the CLD' and the ICC' correspond to a single one-to-two, OTT, module for the stereo signal, using the received spatial information, wherein the calculated channel level difference, CLD', indicates an energy difference between a left channel and a right channel, which are included in the stereo signal, and the calculated Inter-Channel Correlation, ICC', indicates a correlation or coherence between the left channel and the right channel of the stereo signal; and up-mixing the down-mixed mono signal to the stereo signal including the left channel and the right channel, using the calculated spatial information and the single one-to-two, OTT, module for the stereo signal to generate the stereo signal.