A medical apparatus includes a storing section in which information concerning a drug movement in a living body is stored for each of types of a plurality of fluorescent drugs, an arithmetic processing section that acquires, based on the information stored in the storing section, information concerning a target region to which a fluorescent drug is administered, information concerning a method of administering the fluorescent drug to the target region, and information indicating start of administration of the fluorescent drug, information concerning diagnosis start timing, an image pickup section, a position information acquiring section that acquires position information of the image pickup section, and a light source control section that stops, at least from the administration start timing to the diagnosis start timing, irradiation of excitation light and irradiates the excitation light based on the diagnosis start timing and the position information.