A display controller reads an object, which is an intended zoom object, and changes its display form, generating a revised contents organization and displaying the revised contents organization on a display unit, based on an operation content of a user retrieved by an operation retrieving unit, an organization description pertaining to a display aspect of the contents, and a zoom description that describes the zoom action/behavior of each zoom object. Consequently, editing the contents becomes much easier. Further, the user is ensured a fair degree of freedom for viewing the contents.