To provide a processing and selling method for product materials by which a product is easily manufactured in accordance with order contents of a user and the user can easily obtain a desired product without investment in plant and equipment for manufacturing the product.

This method comprizes a step where order information including at least processing information on product materials is inputted to a terminal on the ordering person side and is transmitted to a terminal on the processing and selling person side through a network, a step where product materials are processed on the processing and selling person side on the basis of order information of product materials transmitted from the ordering person side, and a step where product materials processed in the processing step are delivered to the ordering person.