The present invention provides a processing apparatus (10) including: an acquisition unit (11) that acquires an image of a product held in a hand of a customer; an image analysis unit (12) that generates time-series information on a position of the product, based on the image; a determination unit (13) that determines whether the customer has performed a specific action for the product, based on a movement status of the product indicated by the generated time-series information; and a registration unit (14) that registers that the customer has performed the specific action.