A robot system includes a robot, a vision sensor, a controller, and an input unit. The vision sensor configured to measure a feature point and obtain a measured coordinate value. The controller configured to control the robot. The input unit configured to receive an input from a user toward the controller. The controller obtains, via the input unit, setting information data on a determination point which is different from the feature point. The robot system uses a coordinate value of the determination point and the measured coordinate value, and determines whether the robot is taking a target position and orientation.

[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.