A digital broadcast receiver for receiving a broadcast signal, includes a tuner configured to receive the broadcast signal including a table for service, video data for a broadcast program and application signaling information, wherein the table for service includes IP (Internet Protocol) address of a LCT (Layered Coding Transport) channel carrying service signaling information and UDP (User Datagram Protocol) port number of the LCT channel carrying the service signaling information, wherein the application signaling information includes a URL (Uniform Resource Locator) of an entry page of a broadcaster application; a network interface configured to receive at least one content; a cache configured to store the at least one content; and a processor configured to launch the broadcaster application after the digital broadcast receiver receives the application signaling information and then forwards the URL to a first module capable of processing HTML5.