PROBLEM TO BE SOLVED: To eliminate hindrances to endoscope work even though a plurality of input operations are performed simultaneously.SOLUTION: A first observation image, and a second observation image are generated in a first image processing circuit, and a second image processing circuit, and displayed on two monitors, respectively. A certain input operation is applied to both the first observation image and the second observation image through an input member, such as a foot switch, a front panel button, and a keyboard, and in the case that two processing cannot be performed simultaneously or sequentially, processing to video and an input operation having a priority are performed preferentially.
