In an image signal processor, a camera operation estimating part detects a movement vector of an input image in order to estimate, for example, a panning operation in a horizontal direction, a tilting operation in a vertical direction, or a zooming operation such as zooming-in or zooming-out. An image output part reads a particular image signal before and after a camera operation from image signals stored in an image storage memory. The particular image signal is then outputted and displayed on a display means. Further, when there is a plurality of display means, an image before and after the camera operation and an image that is currently broadcast are displayed separately on each of the plurality of display means.