1. A method of measuring an optical characteristic of an optical system using a measurement apparatus, the method comprising the steps of: arranging, on a side of an object plane of the optical system, a plurality of object point measurement devices fixed at predetermined intervals; obtaining information corresponding to each of positions of the object point measurement devices while sequentially changing an object point measurement device to be used for measurement, wherein information corresponding to a position of each of the object point measurement devices is obtained by changing an object point within the object plane of the optical system such that light from the object point enters a corresponding object point measurement device and performing measurement using the corresponding object point measurement device; arranging, on a side of an image plane of the optical system, a plurality of image point measurement devices fixed at predetermined intervals; obtaining information corresponding to each of positions of the image point measurement devices while sequentially changing an image point measurement device to be used for measurement, wherein information corresponding to a position of each of image point measurement devices is obtained by changing the object point within the object plane of the optical system such that light from the object point enters a corresponding image point measurement device and performing measurement using the corresponding image point measurement device; calculating an error attributed to the measurement apparatus based on information corresponding to each of the positions of the object point measurement devices and information corresponding to each of the positions of the image point measurement devices; obtaining information representing the optical characteristic of the optical system using the measurement apparatus while changing the object point plural times within the object plane and performing measurement for each object point; and correcting the measured value based on the error.