Additional information bitstream generating method and apparatus for a multi-object audio signal

The present invention relates to a multi-object audio signal, the additional information bit stream generating method and apparatus. Additional information of the multi-object audio signal according to the present invention, a bit stream generating apparatus comprising a receiving space generated from the multi-object audio signal coding apparatus of the spatial information prompt message input unit, receives information about the multi-object audio signal, preset information preset information input unit, and the spatial cue information and the preset information generating unit generating information bitstream information bitstream, wherein the side information bitstream includes a header region and a frame region, the preset information is included in frame area. According to the present invention, has the effect that, in the frame area by the additional information bitstream generated when a multi-object audio signal coding the preset information is included, so that multi-object audio signal during reproduction can also be an editing or sound engineer intention to change the audio scene information set.