An embodiment of the present invention identifies an animal which has entered a predetermined region. An embodiment of the present invention includes an individual-identifying section (134) which identifies an animal that has entered an animal toilet (1), on the basis of at least one selected from: a body weight of a pet as measured when that pet was in the animal toilet； and identification information indicated by a signal whose strength at the predetermined region is greater than or equal to a threshold value, the signal being emitted from a transmission device worn by a pet.
