Digital broadcast receiver and method for processing a digital broadcast signal

A digital broadcast receiver and method for processing a digital broadcast signal are provided to add a search function to search and refresh to find an available network storage. A control unit(310) receives a search request for an accessible storage unit from an application program including a network storage unit. The control unit has an external storage device searched according to the search request returned to application program. The control unit comprises a middleware. The control unit generates an event in order to return to application program according to a defined function.