1. An information processing method for obtaining two kinds of arrangement information of calibrating indices and a sensor both placed on and relative to an object so as to serve as calibration information, the information processing method comprising steps of: obtaining a captured image of the object; receiving a measurement value of the sensor; detecting information about image coordinates of the respective calibrating indices, from the captured image; and obtaining calibration information based on the measurement value and the information about the image coordinates of the respective calibrating indices.