Disclosed is a method for indicating whether to provide supplementary services through EPG information in a terrestrial DMB system. In this method, a DMB terminal of the terrestrial DMB system receives DMB broadcast data, and extracts the EPG information from the DMB broadcast data. The extracted EPG information is sorted according to service formats of an XML schema for providing the EPG information. Supplementary service information relating to a corresponding program is extracted from the sorted EPG information by means of a program format of the XML schema, and the extracted supplementary service information is stored together with the EPG information. The supplementary service information is provided together with program information of the corresponding program when the EPG information is displayed.