A server device includes: a receiver and a processor. The receiver receives a data request transmitted, from a client device via a resource server. The data request includes attribute information, a data item and a quality request. The processor transmits, to the client device, a first token for requesting quality information indicating a quality of personal data corresponding to the attribute information and the data item and a second token for requesting the personal data. The processor transmits, to the resource server, identification information of a data owner who has consented to providing personal data pertaining to the data item and corresponds to the attribute information when the server device receives the first token from the resource server. The processor transmits a verification result for the second token to the resource server when the server device receives the second token from the resource server.