The information processing system according to the present invention includes: a first selection unit for selecting two or more images from a first data set that includes learning data including an image, a label associated with the image, and auxiliary information; a second selection unit for selecting an image from a second data set including learning data different from the learning data included in the first data set, based on positions in a feature space of the two or more images selected by the first selection unit; and a learning unit for learning a model for estimating a label based on the auxiliary information using the learning data included in the first data set and the learning data corresponding to the image selected by the second selection unit.