1. An image retrieval and registration system comprising: first storing means for storing one or more schematic images which are used to register input images and to retrieve registered images; second storing means for storing input images and retrieved images; mixing means for forming a mixed image signal by mixing an image signal of a schematic image read out of said first storing means and an image signal of an input image or a retrieved image read out of said second storing means; display means for receiving said mixed image signal from said mixing means and for displaying a mixed image of the schematic image and the input image or retrieved image; indicating means for indicating a position of a part within the schematic image displayed on said display means; and control means for registering the schematic image stored in said first storing means into said second storing means together with indicating data for indicating the position of a part within the schematic image indicated by said indicating means, and for retrieving at least one registered image stored in said second storing means, said at least one registered image having indicating data for indicating the position of a respective part within the schematic image indicated by said indicating means.