To determine the presence or absence of an aperture mask in a funduscopic image output by a fundus camera, and to combine the funduscopic image with an aperture mask image formed in an aperture mask-forming section so as to correspond to a determination result. When an aperture mask determination section 34 determines the absence of the aperture mask image in the funduscopic image and the necessity of the addition, the aperture mask-forming section 35 forms a necessary mask, and an aperture mask combine section 36 combines the funduscopic image with the aperture mask image.