A display device including a camera is used by inserting it in the direction of a user's gaze. Alternatively, an image of the same area as that of a scene from a windshield of an automobile may be obtained and the image may be displayed by using an information providing apparatus installed in the automobile. A system provides information to the user by adding a two-dimensional or three-dimensional computer graphics object to an image taken by the camera. The information is directly added to a scene in the direction of the user's gaze and is displayed to the user. Thus the user can easily understand the relationship between the information and the position to which the information is added.