Provided are a privilege granting device, a privilege granting method, and a program capable of providing motivation to continuously purchase a product by posting and checking, between shoppers having purchased the same product, that an activity associated with the product has been done. A post acceptor accepts, from a shopper having purchased a product, a post that the shopper has done an activity associated with the product. A publisher publishes the accepted post. A report acceptor accepts a report that another shopper having purchased the product has read the published post and checked a content of the read post. A determiner determines, when the shopper repurchases the product, a privilege to be granted to the shopper according to whether the report is accepted.