A head mounted display device for displaying a virtual reality image, comprising: a display; a sensor; and a processor configured to: receive direction information indicating a direction in which the HMD device is directed from the sensor; determine an azimuth of the direction in which the HMD device is directed with respect to a user front; set a threshold angle corresponding to a predetermined azimuth angle range with respect to the user front, wherein the threshold angle is a minimum angle for displaying a region in a range of 180 degrees in the user front through a first VR image; control the display to display said first VR image when the direction in which the HMD device is directed is less than the threshold angle, and control the display to display a second VR image when the direction in which the HMD device is directed is equal to or greater than the threshold angle; wherein the first VR image comprises a view region corresponding to the changed direction of the HMD device, and the first VR image is displayed symmetrically around the changed direction of the HMD device, and wherein the second VR image comprises a view region corresponding to the changed direction and the second VR image is displayed such that it corresponds to a direction which is further turned than the changed direction of the HMD device. a display; a sensor; and a processor configured to: receive direction information indicating a direction in which the HMD device is directed from the sensor; determine an azimuth of the direction in which the HMD device is directed with respect to a user front; set a threshold angle corresponding to a predetermined azimuth angle range with respect to the user front, wherein the threshold angle is a minimum angle for displaying a region in a range of 180 degrees in the user front through a first VR image; control the display to display said first VR image when the direction in which the HMD device is directed is less than the threshold angle, and control the display to display a second VR image when the direction in which the HMD device is directed is equal to or greater than the threshold angle; wherein the first VR image comprises a view region corresponding to the changed direction of the HMD device, and the first VR image is displayed symmetrically around the changed direction of the HMD device, and wherein the second VR image comprises a view region corresponding to the changed direction and the second VR image is displayed such that it corresponds to a direction which is further turned than the changed direction of the HMD device. receive direction information indicating a direction in which the HMD device is directed from the sensor; determine an azimuth of the direction in which the HMD device is directed with respect to a user front; set a threshold angle corresponding to a predetermined azimuth angle range with respect to the user front, wherein the threshold angle is a minimum angle for displaying a region in a range of 180 degrees in the user front through a first VR image; control the display to display said first VR image when the direction in which the HMD device is directed is less than the threshold angle, and control the display to display a second VR image when the direction in which the HMD device is directed is equal to or greater than the threshold angle; wherein the first VR image comprises a view region corresponding to the changed direction of the HMD device, and the first VR image is displayed symmetrically around the changed direction of the HMD device, and wherein the second VR image comprises a view region corresponding to the changed direction and the second VR image is displayed such that it corresponds to a direction which is further turned than the changed direction of the HMD device.