PROBLEM TO BE SOLVED : To provide a method for selling subscription articles/periodic purchasing articles in an information providing service using information communication means by a real estate agent that enriches a service of providing real estate information.SOLUTION : The method comprises a step of a customer B applying for admission 1 to a real estate agent A, a step of the real estate agent A providing real estate information 2 for the customer B to mediate a contract 23 for real estate between the customer B and a real estate owner D, a step of introducing subscription articles/periodic purchasing articles 3 to the customer B having signed the contract 23, a step of the customer B applying for a contract 4 for an article to the real estate agent A, and a step of the real estate agent A mediating a contract 12 with a subscription article/periodic purchasing article seller C to conclude a contract 13 for the subscription article/periodic purchasing article between the customer B and the seller C according to the article contract application 4 of the customer B and permission 5 of the customer B to use personal information.