A method for identifying extender text tables of an electronic program guide in a DTV is disclosed. In the present invention, the extender text tables are identified by processing an ETT section in the same manner as other tables using a value capable of identifying the extender text table sections. Particularly, an event_id is input in a table_id_extension within ETT sections, so that the ETT sections can be identified at a receiving or a transmitting party without parsing the ETT sections.