A method and apparatus for transmitting or receiving a broadcast signal are discussed. The method for transmitting includes generating service data of a broadcast service, first signaling information for signaling the service data and second signaling information including information for locating the first signaling information, wherein the second signaling information further includes information for identifying the broadcast service and uniform resource locator (URL) information for obtaining the first signaling information, wherein the URL information to which additional information is appended is used for generating a request for obtaining the first signaling information, and wherein the additional information includes information for indicating which type of the first signaling information is requested; generating a broadcast signal including the service data and the second signaling information; and transmitting the broadcast signal.