1. An endoscope system comprising: an image information obtaining section for obtaining image information by imaging an observation object; a biological function information calculating section for calculating biological function information of said observation object based on said image information; a first image generating section for producing a biological function information image that images said biological function information; an emphasized image generating section for producing an emphasized image, in said emphasized image, a bright part within an abnormal area in which a calculation result of said biological function information calculating section is likely to be abnormal in said biological function information image being further brightened for emphasis; and a display section for displaying said emphasized image.