A service providing server collects call session information that identifies communication established between terminals and service usage IDs that identify the terminals for each terminal. Then, the service providing server identifies call session information pieces indicating the same communication and associates Web services with each other. When the service providing server provides the associated Web services to the terminals, the service providing server identifies service usage IDs that identify the terminals and control provision of the Web services so that each Web service is provided according to history information stored in a history information database in association with service usage IDs.