IMAGE PROCESSING APPARATUS, IMAGE PROCESSING METHOD, PROGRAM, AND RECORDING MEDIUM

It enables a user to confirm an already designated area without changing layers. Image data of plural layers is generated on a same image, and an image area being a target of editing is designated on the image data of each layer. Then, if the image area of one layer is designated, a CRT controller causes a CRT to display the image area of each layer designated before the image area of the one layer is designated, in a predetermined display method different from a display method for the designated image area of the one layer.