1. A display apparatus comprising: a light outputter; a camera; and a processor configured to: control the light outputter to output a light toward a user, identify, from an image of the user captured by the camera, a pupil of the user, an iris of the user and a glint area obtained by a reflection of the light, and identify a direction of the user's gaze based on a distance between the pupil and the glint area, and a size of the iris.