According to a service management method to supply products-in-circulation to service receivers, a service management system is built that enables the service provider to manage whether the service receivers are using those products-in-circulation delivered from the service provider in an authorized manner. This provides a reasonable service whereby the service receiver is charged only for those products-in-circulation the service receiver has actually used. To this end, the service management device in accordance with the present invention includes: a memory section for registering data of products-in-circulation to be delivered to the service receivers; an input section for entering current status of the products-in-circulation; and an arithmetic processing section for calculating charges on the basis of the number of products-in-circulation that are regarded as having been actually used, not the total number of the delivered product-in-circulations.