A fluorescence image display apparatus is provided; wherein, when a pseudo color
image representing the tissue state of a target subject is obtained, based on a
fluorescence image emitted from the target subject upon the irradiation thereof
by an excitation light, the tissue state can be recognized regardless of the intensity
of the fluorescent light. Based upon the statistical quantity of a wide band fluorescence
image computed by a statistical quantity computing means, a gain that the wide
band and narrow band fluorescence image data are to be multiplied by is computed
by a gain computing means. A gain multiplying means multiplies the wide band and
narrow band fluorescence image data by the gain, whereby a green gradation is assigned
to the wide band fluorescence image and a red gradation is assigned to the narrow
band fluorescence image, and a composite image data is obtained by an image composing means.