An apparatus for spatially separating sounds from at least two sound sources includes a sound detection unit and a sound control unit. The sound detection unit detects a first sound from a first sound source while a second sound is outputted from a second sound source. The sound control unit performs a head-related transfer function (HRTF) on the second sound to move the second sound to a user's desired position according to the detection result, thereby the second sound is set as a background sound.