1. An image editing method comprising the steps of: inputting an instruction to move a trimming area of an image; and arithmetically operating a movement amount and a magnification ratio of the trimming area in accordance with the instruction input in said input step, wherein, if the instruction to move the trimming area excessively over a frame of the image is input in said input step, said arithmetic operation step reduces the trimming area in accordance with an excess movement amount over the frame of the image.