1. A method of tracking an eye gaze, the method comprising: detecting a facial feature in a captured initial image; three-dimensionally modeling the detected facial feature; tracking the three-dimensionally modeled facial feature in consecutively captured images; detecting an iris center in the consecutively captured images; acquiring an eye gaze vector based on the tracked three-dimensionally modeled facial feature and the detected iris center; and acquiring a gaze point on a display unit based on the eye gaze vector.