A medical apparatus includes a storing section in which information concerning a drug movement in a living body is stored in advance 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, a target region to which a first fluorescent drug is administered, a method of administering the first fluorescent drug to the target region, and administration time, diagnosis start time and diagnosis end time corresponding to the first fluorescent drug and sets, based on the diagnosis end time corresponding to the first fluorescent drug, administration start time of a second fluorescent drug, and a control section that performs control for starting administration of the second fluorescent drug when a current time reaches the administration start time of the second fluorescent drug and, when the current time exceeds the diagnosis end time corresponding to the first fluorescent drug, performs control for lowering an irradiating light amount of excitation light for exciting the first fluorescent drug.
