To visually display on a monitor screen the direction and volume of a sound source to be inserted in an image, a sound editing apparatus comprises a sound source direction setting unit for setting the sounding direction of a sound source; a sound source signal dividing unit for dividing a monaural sound source signal into left- and right-channel stereo signals according to the sounding direction of the sound source; a display unit for reproducing images from the video medium and displaying the images in which the sounds are to be inserted; and a sound source direction superimposing unit for superimposing a predetermined mark, which indicates the sounding direction, in the video images displayed on the display unit.