In the case where a value of the aspect ratio of the display area of an image display device is larger than a value of the aspect ratio of a captured image indicated by an imaging signal, image processing for making the magnification of an image of a peripheral portion outside a central portion of the captured image larger than the magnification of an image of the central portion so as to match the aspect ratio of the display area of the image display device is performed. Accordingly, the magnification of the image of the peripheral portion of the captured image is increased by using the display area that is elongated in the horizontal direction, without degrading the visibility of the image of the central portion of the captured image. As a result, it is possible to improve the visibility of the image of the peripheral portion.
