1. A movable display apparatus comprising: a display unit to display an image; a camera provided on the display unit to acquire an image of a user; a head mounted device (HMD) to measure a head rotation direction and a pupil direction of the user; a control unit to recognize a sightline of the user using the image of the user acquired by the camera and the head rotation direction and the pupil direction measured by the HMD and to control a posture of the display unit according to the recognized sightline of the user; and a driving unit to move the display unit under the control of the control unit.