An operation screen generating apparatus includes: an image-in-work-screen generating unit that displays a subject image on a work screen, which is displayed at an aspect ratio same as that of a print area, in a display position and at a display magnification designated by user operation; and an image-in-confirmation-screen generating unit that displays in enlargement, on a confirmation screen prepared separately from the work screen, a reference line representing an outer edge position of the work screen and a subject image located near an outside and an inside of the reference line.