1. An image display apparatus for a shovel that includes a lower-part traveling body, an upper-part turning body turnably placed on the lower-part traveling body, and an attachment mounted on the upper-part turning body, and performs work in a work area by driving the attachment, the image display apparatus comprising: a processing part configured to process a surface image of the work area captured with a camera by subjecting the captured surface image to image processing that adds a distribution of depressions and elevations of the work area to the captured surface image; and an image display part configured to display the processed captured surface image of the work area, wherein the image processing further adds an instruction area to the captured surface image, the instruction area indicating an area to be worked on, and wherein the image display part is configured to display the captured surface image of the work area with the instruction area indicated thereon by a frame, the frame being inside the work area and surrounding the instruction area.