1. A method of tracking a position of a head of a listener comprising a skin region, the method comprising: obtaining two images using two image pickup units; determining the head of the listener in at least one of the two images by detecting an edge of the skin region of the head of the listener; tracking a skin color of one of the images, thereby obtaining a 2-dimensional (2D) coordinate value of the position, wherein a Gaussian skin classifier is applied only to a region of interest (ROI) consisting of the head of the listener substantially bound by the detected edge of the skin region of the head in order to reduce computation required to achieve color tracking; and obtaining a distance between the image pickup units and the listener using stereo area correlation.