1. A device for updating a component of application software in a digital broadcasting signal receiver, comprising: a storage section configured for storing an executing data for executing an application software that produces a user interface of the digital broadcasting signal receiver; a program specific information/service information extracting section configured for extracting program specific information/service information (PSI/SI) from a received digital broadcasting signal; an updating data extracting section configured for extracting an updating information for partially updating the application software from the PSI/SI, and for extracting an updating data for updating the application software from the received digital broadcasting signal according to the updating information in order to update the executing data stored in the storage section to generate updated executing data; and an application software section configured for updating and executing the application software according to the updated executing data.