To provide a probability acquisition apparatus and the like that can provide accurate probabilities of a match and a mismatch between two three-dimensional images of a target object, a probability acquisition apparatus performs zebra shading processing on a first image that is a three-dimensional image of an automotive clay model and a second image that is a 3D-CAD image to obtain a first zebra image and a second zebra image, obtains a first selected image from the first zebra image with noise removed and a second selected image from the second zebra image with features extracted, and inputs a superimposition image of the first selected image and the second selected image to a CNN 15b to thereby obtain a probability of a match between the first selected image and the second selected image.