A cat toilet, etc., which specifies precisely one cat who entered a toilet for cat is provided. The present invention relates to a camera for capturing a plurality of images of a cat entering a cat toilet, a cat identifying process for identifying identifiers of one cat appearing in a plurality of images based on a plurality of images captured by the camera section, the cat identification processing section extracts each feature amount from a plurality of images, determines the identifier of one cat as the identification result for each image based on the feature amount, and makes a majority decision of the identification result based on this, identifiers of one cat appearing in a plurality of images are specified.