A control API controls secret data to be stored in a secret data storage area which is accessible only to the control API. Moreover, the control API controls the file information storing part in the secret data storage area to store (i) storing location information of the stored secret data and (ii) administrative storage location information notified by the web application so that the storing location information and the administrative storage location information are associated with each other. This makes it possible to (i) prevent a leakage of confidential information and (ii) allow an authorized web application to easily use the confidential information.