An electronic endoscope processor has a configuration including: a converting means for converting pieces of pixel data that are made up of n (n≥3) types of color components and constitute a color image in a body cavity into pieces of pixel data that are made up of m (m≥2) types of color components, m being smaller than n; a color component correcting means for correcting the converted pieces of pixel data made up of m types of color components with use of a predetermined color component correction coefficient; and an acquiring means for acquiring an evaluation result related to a target illness based on the corrected pieces of pixel data made up of m types of color components.