A method and an apparatus for processing a media signal are provided to generate a surround signal in a decoding device incapable of generating a multi-channel signal by using HRTF(Head-Related Transfer Functions) filter information or filter information according to a user. A source mapping part(1010) generates corresponding source mapping information according to sources by using spatial information indicating a feature between multi-sources. A synthesizing part(1030) generates rendering information by the source mapping information and filter information for providing surround effect. A smoothing part(1042) performs smoothing by using adjacent rendering information in the rendering information. The smoothing is performed in a time domain or a frequency domain.
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