An image processor enabling a user to quickly select desired images from a large number of images without scrolling repeatedly through the images. The image processor assigns image numbers to segments of a scroll bar and displays image data corresponding to an image number assigned at the position on the scroll bar pressed by the user. The image processor also reduces the number of image numbers assigned per segment of the scroll bar near the image number at the pressed position on the scroll bar to facilitate the user in specifying a desired image through a subsequent input operation.