A service providing method, the method includes generating, by an information processing device, data relating to a session and a cookie relating to a certification including the data when the certification is successful in response to a certification request of the session received from a client device, transmitting, by the information processing device, the data and the cookie to the client device, receiving, by the information processing device, a service request which is given the data as a query parameter and the cookie from the client device, and providing, by the information processing device, a service of the service request to the client device when the data included in the cookie matches with the data which is given as the query parameter.