In a system that corresponds content to a user and permits the user to browse particular content corresponding to the user, the system timely informs the user of a page to which update has been performed. A content update information obtaining section obtains content update information showing the update of content, and a notification mail generation section generates a notification mail having an e-mail, which is obtained based on browsing-permitted subject identification code administrated by a content administration section, as a destination. Further, when it is detected that the notification mail is non-deliverable, the system may prevent the user from browsing the particular content.