To provide a method and system for circulation which transmits information concerning products such as a producing method and producer information to a consumer and which allows the consumer to buy the merchandise providing service using such a product without care.

In the circulating method of products, etc., by an environmental protection type method, a prescribed authentication code is imparted to a product and/or the merchandise providing service using the product meeting an acknowledging condition of being a producing method, a sales method, a working method, a circulation method and an operation method of the environmental protection type method and information concerning the product recorded corresponding to the authentication code is notified by inputting the authentication code at the time of selling the product or providing the service (in the middle of sales, after sales).