1. A method for stereo gaze tracking, the method comprising: tracking a gaze point of a first eye of the user on a first one of the right and left two-dimensional display screens; and estimating a gaze point of a second eye of a user on a second one of right and left two-dimensional display screens by processing information of the tracked gaze point of the first eye and information of right and left stereo images of the scene respectively being displayed on the right and left 2-D display screens.