In an information processing program, a processing unit generates a corrected first image by correcting, based on a biometric image in which a predetermined body part is imaged, the posture of the body part in the biometric image. The processing unit generates a feature image by extracting a feature pattern indicating a feature of the shape of the body part from the corrected first image. The processing unit generates a corrected second image by correcting, based on the feature image, the posture of the feature pattern in the feature image. The processing unit calculates authentication data for biometric authentication based on the corrected second image.