A digital broadcasting system and a data processing method are disclosed. The digital broadcast receiving system includes a baseband processor, a management processor, and a presentation processor. The baseband processor receives a broadcast signal including mobile service data and main service data. Herein, the mobile service data configure a Reed-Solomon (RS) frame, and the RS frame includes mobile service data and at least one channel configuration information on the mobile service data. The management processor acquires simple guide information on at least one of a current program and a next program of a corresponding channel from the channel configuration information and stores the acquired simple guide information. The presentation processor receives simple guide information of any one of the current program and the next program, wherein the programs are provided as mobile service through a user-selected channel, from the management processor and displays the received simple guide information on a portion of a display screen of the corresponding channel.