1. An information processing method of calculating information regarding a measurement target using captured images of markers existing in a real space, comprising the steps of: obtaining an image captured by an image pickup unit; extracting markers from the captured image; obtaining position and orientation information regarding the image pickup unit; determining, on the basis of placement information regarding the markers, which is managed by a marker information management unit, and the position and orientation information regarding the image pickup unit, whether to use the captured image corresponding to the position and orientation information to calculate the information regarding the measurement target; and calculating the information regarding the measurement target using the captured image in the case that it is determined to use the captured image.