1. A method of controlling an apparatus, the method comprising: when a plurality of images are captured from an image pickup device during a predetermined period of time to generate a panoramic image, capturing at least one image from among the plurality of images by reading, from the image pickup device, image data corresponding to a predetermined sub-region of a preview image displayed on the apparatus; and setting the predetermined region by excluding a region of the preview image, the excluded region comprising all area of the preview image adjacent to the predetermined region in a direction perpendicular from a predefined boundary separating the excluded region and the predetermined region, the boundary being parallel to the panoramic image photographing direction, wherein a first number of the plurality of images is greater than a second number of images captured by reading, from the image pickup device, second image data corresponding to an entire region of the preview image during the predetermined period of time; the method further comprising: when the predetermined region is set, displaying a textual or symbolic representation of a quantity of images that may be captured to form the panoramic image.