An image processing apparatus includes: an image acquiring unit configured to acquire image information representing an image acquired by irradiating a gland duct with excitation light and observing fluorescence generated in the gland duct a fluorescence intensity computation unit configured to compute a value corresponding to intensity of the fluorescence as fluorescence intensity based on the image information and an image determination unit configured to determine whether or not an endocrine cell exists in the gland duct based on the fluorescence intensity computed by the fluorescence intensity computation unit, and to determine abnormality of the gland duct based on a determination result of the endocrine cell.
