A medical apparatus includes: a storing section in which information concerning a drug kinetics in a living body is stored in advance for each of plural kinds of fluorescent drugs; a processing section that acquires information concerning diagnosis start timing corresponding to a desired fluorescent drug based on information stored in the storing section, information concerning a target region to which the desired fluorescent drug is administered, information concerning a method of administering the desired fluorescent drug to the target region, and information indicating start of the administration of the desired fluorescent drug; and a light source control section that controls radiation of excitation light for exciting the desired fluorescent drug to a stop state until the diagnosis start timing is reached and controls, at and after the diagnosis start timing, the radiation of the excitation light to a state in which the excitation light can be radiated.