An information processing system includes: a state determiner that determines a state of an animal using a captured image of the animal; a feeling determiner that determines a feeling of the animal corresponding to the state of the animal determined by the state determiner, on the basis of a notification wording DB indicating a relationship between the state and the feeling of the animal; and a notification processor that notifies user terminal 4 of a wording indicating the feeling of the animal determined by the feeling determiner.