The present invention relates to a digital audio watermark inserting/detecting method and apparatus. The present invention provide the digital audio watermark inserting method having the step of encoding a digital audio signal by using a scale factor table, the method including the steps of: transforming the digital audio signal into a plurality of sub-band samples; extracting a scale factor being an amplitude factor of the transformed sub-band samples; transforming the extracted scale factor into a scale factor index by using the scale factor table; and inserting a watermark signal into the scale factor index in the transforming of the extracted scale factor. Accordingly, the present invention has an effect in that the additional noise or distortion is not caused while the watermark is effectively inserted.