1. An apparatus for detecting a face, comprising: a first distance image acquiring unit to acquire a first distance image for a background based on at least two obtained images; a second distance image acquiring unit to acquire a second distance image for an object and the background based on at least two other obtained images; a distance difference image acquiring unit to acquire a distance difference image between the first distance image and the second distance image; an object mask creator to create an object mask based on the acquired distance difference image; an object area detector to detect an object area in one of the at least two other obtained images, using the created object mask; and a facial area detector to detect a face in the detected object area.