The location of a tumor can be more easily and accurately recognized in the photodynamic diagnosis in which: a fluorescence image is produced by radiating excitation light having a specific wavelength from an excitation light source and capturing an image of fluorescence from a photosensitizer excited by the excitation light by a fluorescence imaging device and an integrated image is produced by integrating the fluorescence image with a first image representing a positional relation of at least a part of a human body.
