Abstract: A medical system e.g. for diagnosing and/or treating a patient has a system controller for controlling the system-specific components. The controller works together with an input device and is additionally assigned a data storage unit in which it is possible to store at least one operating menu. The operating menu can be called up by means of the input device and can be displayed on an indicating or display device. The operating menu includes a plurality of operating functions which can be selected, e.g., by means of a movable marker. When an operating function is selected its associated executable function is executed under control of the system controller. The system is further provided with the functionality of allowing a user to freely select specific operating functions from among the totality of operating functions assigned to the one or more operating menus and store the selected functions in the data storage device grouped as a separate, independent operating menu.