1. A method for processing updated data of an application in a headend of a digital data broadcasting system, comprising the steps of: a) confirming that the application data are updated upon one of an application content update request of a subscriber terminal and application file update of a contents provider; b) generating signaling information of the updated application data and transmitting the signaling information; c) separating updated objects from non-updated objects among objects constituting the application, and updating a file system structure and contents of the application; and d) forming modules including the updated objects and modules including the non-updated objects, updating version information of the modules including the updated objects.