A method for transmitting a broadcast signal in a digital broadcast transmitter, the method including generating components of a service; generating first signaling information including session instance description information for at least one Real-Time Object Delivery over Unidirectional Transport (ROUTE) session and at least one Layered Coding Transport (LCT) channel in which the components of the service are delivered, wherein the session instance description information includes first source Internet Protocol (IP) address information of the at least one ROUTE session, first destination IP address information of the at least one ROUTE session, first destination port information of the at least one ROUTE session, and transport session identification information for the at least one LCT channel; generating second signaling information which is used for acquiring the first signaling information, wherein the second signaling information includes information for indicating a channel number of the service, wherein the second signaling information further includes bootstrap information and signaling transport mode information for indicating a type of delivery protocol of the first signaling information, and further the bootstrap information changes depending on the signaling transport mode information, and wherein the bootstrap information included in the second signaling information includes second source IP address information, second destination IP address information, and second destination port information for the first signaling information, wherein the at least one LCT channel is acquired based on the bootstrap information included in the second signaling information; and transmitting the broadcast signal including the components of the service, the first signaling information, and the second signaling information based on at least one Physical Layer Pipe (PLP).