1. A movable display apparatus comprising: a display unit configured to display an image; a camera provided on the display unit and configured to acquire an image of a user; a head mounted device (HMD) configured to measure a head rotation direction and a pupil direction of the user; a control unit configured 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, control a posture of the display unit according to the recognized sightline of the user, and control the displaying of the image by the display unit according to the recognized sightline of the user; a camera image processing unit configured to extract a face direction of the user from the image of the user acquired by the camera, wherein the control unit is further configured to estimate the head rotation direction for recognizing the sightline of the user using the extracted face direction and the measured head rotation direction of the user; and a driving unit configured to move the display unit under the control of the control unit, wherein the display unit is configured to be movably provided on a manipulator to display the image, and the control unit is configured to compute a difference between a sightline position of the user based the recognized sightline of the user and a current position of the display unit, and generate a motion path of the manipulator.