1. An endoscopic diagnosis support method carried out in an endoscopic diagnosis support apparatus for supporting an endoscopic diagnosis performed based on an endoscopic image picked up by an endoscope observation apparatus, comprising: calculating a first chromaticity and a second chromaticity based on a ratio of color signals that form a three-primary-color signal from a color signal of each of plural image zones obtained by dividing the endoscopic image, wherein the first chromaticity is a ratio of a green component to a red component and wherein the second chromaticity is a ratio of a blue component to the green component; and discerning an image zone including a bleeding region by judging that the first chromaticity of each of plural image zones constituting the endoscopic image is smaller than a first resultant value, and that the second chromaticity of each of plural image zones constituting the endoscopic image is larger than a second resultant value, wherein the first resultant value is a sum of: (a) a first predetermined margin that varies dynamically with a variation parameter and (b) an average value of the first chromaticity of all image zones constituting the endoscopic image, and wherein the second resultant value is a sum of: (a) a second predetermined margin that varies dynamically with a variation parameter and (b) an average value of the second chromaticity of all image zones constituting the endoscopic image; wherein the variation parameter is a standard deviation, chromaticity variation coefficient, variation value or gradient.