IMAGE DATA REPRODUCING APPARATUS WITH CHANGING PROPORTIONS OF COMBINED ENLARGED IMAGES, METHOD OF CONTROLLING SAME AND CONTROL PROGRAM THEREFOR

When a transition is made from display of one image of a subject to display of another image of a subject in a slideshow, the transition is made in a natural manner. A first enlarged image is obtained by cropping and enlarging a portion of a subject image so as to include a face-image portion. A plurality of first enlarged images are obtained in such a manner that a cropping zone gradually decreases and the enlarging rate of the cropped image gradually increases. A first enlarged image in which the face-image portion is displayed in close-up is obtained. When a plurality of enlarged images are displayed one after another and a first enlarged image prevailing at the time of image transition is displayed, a second enlarged image in which a face image contained in a second subject image is shown in close-up is displayed. Second enlarged images that gradually zoom out from the face-image portion are displayed one after another to thereby make a transition to display of the second subject image.