The information about an interchangeable lens is acquired, and the size of an image capture range, which is the range corresponding to a capture image in an optical image, is calculated based on the information about the interchangeable lens. When the image capture range is smaller than or equal to a range to be shown by the angular field of the optical image, a first image showing the image capture range in the optical image is displayed on a display device, and when the image capture range is larger than the range to be shown by the angular field of the optical image, a second image different from the first image showing the image capture range in the optical image is displayed on the display device such that the second image is superimposed on at least either of the four corner vicinities and four side vicinities of the optical image.