A control device comprising: a control unit configured to control a position and an attitude of an imaging unit by driving an arm unit so that a registered position and attitude condition is satisfied when capturing an image during a surgical operation, and a storage unit configured to store the registered position and attitude condition; wherein the registered position and attitude condition is a condition that prescribes a position and an attitude of the imaging unit with respect to a surgical site to obtain a desired image, the control unit is configured to set the registered position and attitude condition following a manual modification of the position and attitude of the imaging unit by an operator, to register a position and attitude condition resulting from the manual modification by the operator as the registered position and attitude condition stored in the storage unit to be used in future for controlling the position and the attitude of the imaging unit by the control unit; the storage unit is configured to store a plurality of registered position and attitude conditions; and the control unit is configured to control the position and an attitude of the imaging unit by driving the arm unit so that one of the plurality of registered position and attitude conditions designated by the operator is satisfied during capture of the image during the surgical operation; wherein, in a case that the position and the attitude of the imaging unit are modified after the position and the attitude of the imaging unit were controlled by the control unit so that the registered position and attitude condition was satisfied, the registered position and attitude condition is updated to correspond with the modified position and attitude of the imaging unit. a control unit configured to control a position and an attitude of an imaging unit by driving an arm unit so that a registered position and attitude condition is satisfied when capturing an image during a surgical operation, and a storage unit configured to store the registered position and attitude condition; wherein the registered position and attitude condition is a condition that prescribes a position and an attitude of the imaging unit with respect to a surgical site to obtain a desired image, the control unit is configured to set the registered position and attitude condition following a manual modification of the position and attitude of the imaging unit by an operator, to register a position and attitude condition resulting from the manual modification by the operator as the registered position and attitude condition stored in the storage unit to be used in future for controlling the position and the attitude of the imaging unit by the control unit; the storage unit is configured to store a plurality of registered position and attitude conditions; and the control unit is configured to control the position and an attitude of the imaging unit by driving the arm unit so that one of the plurality of registered position and attitude conditions designated by the operator is satisfied during capture of the image during the surgical operation; wherein, in a case that the position and the attitude of the imaging unit are modified after the position and the attitude of the imaging unit were controlled by the control unit so that the registered position and attitude condition was satisfied, the registered position and attitude condition is updated to correspond with the modified position and attitude of the imaging unit.