1. A method of generating fluorescence diagnostic information comprising the steps of detecting first fluorescence information on fluorescence emitted from an object part exposed to first stimulating light, obtaining a first characteristic value on the basis of the first fluorescence information, and outputting a first fluorescence diagnostic information reflecting the first characteristic value, and detecting second fluorescence information on fluorescence emitted from the object part exposed to second stimulating light, obtaining a second characteristic value on the basis of the second fluorescence information, and outputting a second fluorescence diagnostic information reflecting the second characteristic value, wherein the wavelength of the first stimulating light is such that when the first stimulating light is projected onto clean object parts different in properties, different first characteristic values are obtained on the basis of the respective pieces of fluorescence information on fluorescences emitted from the object parts, and the wavelength of the second stimulating light is such that when the second stimulating light is projected onto a clean object part and an unclean object part, different second characteristic values are obtained on the basis of the respective pieces of fluorescence information on fluorescences emitted from the clean object part and the unclean object part.