1. An image display method comprising; a display step of displaying a predetermined image and a dynamic image; a decision step of deciding whether a specific target in said dynamic image is positioned within a display area of said predetermined image: and a signal generating step of, in the state that said specific target is positioned within said display area, generating a signal for displaying an image wherein a target image and an overlapped portion of said predetermined image with said specific target are synthesized on the image, said target image comprising at least one of said specific target and a mark whose position is designated by a position of said specific target, so as to allow, said target image and the overlapped portion of said predetermined image with said target image, to be visible.