The present invention prevents useless defect correction from being effected on pixels for obtaining a radiation image, to thereby improve the reliability of the radiation image provided for diagnosis.An initial defect map 1 in which a defective pixel extracted during shipment from a factory is registered, a QC defect map 2 in which a defective pixel extracted during periodical inspection in the market is registered, and a pseudo-defect map 3 in which a pseudo-defective pixel of abnormal sensitivity extracted during the shipment from the factory is registered are prepared to thereby enable the pseudo-defective pixel registered in the pseudo-defect map 3 to be eliminated from the object of defect correction so that useless defect correction can be curtailed.