A head mounted display (HMD) device including a display configured to display an image; a communication processor configured to communicate with a massage chair; a sensor configured to acquire data about a gaze direction of a user wearing the HMD device; and a controller configured to select a massage part of the massage chair among a plurality of massage parts based on the gaze direction of the user, and transmit a control command to the massage chair for controlling the massage chair to massage the selected massage part.