This method is for calibrating a coordinate system of an image capture device and a coordinate system of a robot arm in a robot system that includes a display device, the image capture device, and the robot arm to which one of the display device and the image capture device is fixed, the robot arm having a drive shaft. The method includes: acquiring first captured image data based on first image data; acquiring second captured image data based on second image data different from the first image data; and calibrating the coordinate system of the image capture device and the coordinate system of the robot arm, using the first captured image data and the second captured image data.