The invention intends, in preparing so-called ID photograph by cutting out an area from the image of a person, to obtain an appropriate area with simple operations. The method the invention comprises a designation step s201 of designating a rectangle circumscribed about a face area on an original image including a human face, an acquisition step s202 of acquiring the vertical length and the horizontal length of the rectangle designated by the designation step, and a determination step s203 of determining a cutout area including the face area, based on the vertical length and the horizontal length.