A medical apparatus includes an operator attribute information storing unit, a medical data storing unit, a data authorship information storing unit, and an access control unit. The operator attribute information storing unit stores attribute information of an operator as operator attribute information. The medical data storing unit stores medical data. The data authorship information storing unit stores authorship information of medical data as data authorship information. The access control unit performs access control so as to control an access of the operator to medical data by using the operator attribute information and the data authorship information.