[Object] To calibrate an internal model more efficiently and more precisely [Solution] Provided is a robot arm apparatus including: an arm unit made up of a plurality of links joined by one or a plurality of a joint unit, the arm unit being connectable to an imaging unit. An internal model including at least geometric information about the arm unit and focus position information about the imaging unit is updated using internal model information acquired in a state in which the imaging unit is pointed at a reference point in real space.
