Any one of acquired images is set as a reference image, and an image other than the reference image is set as a comparison image. According to a portion or a disease, a first image processing of extracting an anatomic region is executed with respect to the reference image, and a second image processing of extracting an anatomic region is executed with respect to the comparison image. Whether the comparison image is available as correct answer data is determined using the anatomic region of the reference image and the anatomic region of the comparison image. The comparison image determined to be available as the correct answer data is registered as the correct answer data.