A display device comprising: a display panel configured to provide an image containing driving information; a concave mirror configured to reflect the image to a windshield, so as to allow a driver to view a virtual image via the windshield; a sensing unit configured to sense a position of the driver, the sensing unit including one tracking camera to sense a movement of the driver's eyes or the driver's head; a drive unit configured to move the concave mirror; and a controller connected to the display panel, the sensing unit, and the drive unit, wherein the controller is configured to control the drive unit so as to move the concave mirror in order to move a view box when the sensing unit senses variation in the position of the driver, the view box being an area in which the entire image containing the driving information is seen by the driver, and wherein the controller is configured to control the display panel so as to correct a position of the virtual image when the concave mirror is rotated as the position of the driver changes, characterized in that the controller is configured to control the display panel such that the image on the display panel is moved leftward by a second prescribed distance, in order to correct the rightward movement of the virtual image by a first prescribed distance when the concave mirror is rotated clockwise, and wherein the controller is configured to control the display panel such that the virtual image is fixed so as to match a forward scene, and when the sensing unit senses that the position of the driver deviates from the view box despite the rotation of the concave mirror, the controller is configured to control a notification module so as to provide the driver with a warning message announcing that the driver deviates from the view box due to excessive movement. a display panel configured to provide an image containing driving information; a concave mirror configured to reflect the image to a windshield, so as to allow a driver to view a virtual image via the windshield; a sensing unit configured to sense a position of the driver, the sensing unit including one tracking camera to sense a movement of the driver's eyes or the driver's head; a drive unit configured to move the concave mirror; and a controller connected to the display panel, the sensing unit, and the drive unit, wherein the controller is configured to control the drive unit so as to move the concave mirror in order to move a view box when the sensing unit senses variation in the position of the driver, the view box being an area in which the entire image containing the driving information is seen by the driver, and wherein the controller is configured to control the display panel so as to correct a position of the virtual image when the concave mirror is rotated as the position of the driver changes, characterized in that the controller is configured to control the display panel such that the image on the display panel is moved leftward by a second prescribed distance, in order to correct the rightward movement of the virtual image by a first prescribed distance when the concave mirror is rotated clockwise, and wherein the controller is configured to control the display panel such that the virtual image is fixed so as to match a forward scene, and when the sensing unit senses that the position of the driver deviates from the view box despite the rotation of the concave mirror, the controller is configured to control a notification module so as to provide the driver with a warning message announcing that the driver deviates from the view box due to excessive movement.