1. An electronic endoscope system comprising: a plurality of electronic endoscopes; a storing medium that stores at least one recorded image; an image indicating device that indicates images captured by said plurality of electronic endoscopes; an image storing processor that stores at least one image captured by one of said plurality of electronic endoscopes, in said storing medium as said recorded image; a comparative images indicating processor that executes image signal processing, so that a live image being captured by one of said plurality of electronic endoscopes, and said recorded image stored in said storing medium, are comparatively indicated on a screen of said image indicating device.