Disclosed is a head mounted display (HMD) device. A HMD device for providing a service that provides a virtual reality (VR) image comprises: a display; a sensor for sensing a direction to which the HMD device is oriented; and a processor for controlling the display to provide a first part of the VR image when the sensed direction to which the HMD device is oriented is changed within a predetermined range on the basis of the front of a user, and to provide a second part of the VR image when the sensed direction to which the HMD device is oriented is changed to escape from the predetermined range on the basis of the front of the user.