Abstract: The present invention provides a processing apparatus (10) including: a classification execution unit (12) that executes class classification, based on an inference device; a computation unit (13) that computes a precision of a class determined by the class classification; a processing unit (14) that outputs a class determined by the class classification and accepts a correct/incorrect input from an operator when the precision is less than a reference value; and a registration unit (15) that registers a product determined by the class classification as a purchase target when the precision is equal to or more than the reference value, and registers a product determined by a correct/incorrect input from the operator as a purchase target when the precision is less than the reference value.