A disclosed mediation apparatus collects data of transactions between a provider holding data of a user and a terminal of the user, for authorizing utilization of the data of the user by a consumer, and stores matching data to determine whether response data received from the provider at next time and subsequent times is substantially the same as the response data previously received and reply data used when sending answer data to the provider into an automatic response data storage unit. Thus, the mediation apparatus automatically respond on behalf of the terminal of the user at the next time and subsequent times. Therefore, it is possible to simplify user operations.