DIGITAL VIDEO BROADCASTING NETWORK SYSTEM AND METHOD OF OBTAINING PROGRAM INFORMATION IN DIGITAL VIDEO BROADCASTING

摘要

A digital video broadcasting network system includes a program information server to deliver program information by using Internet Protocol, and a client device to obtain and save the program information through the Internet Protocol. The program information server delivers the program information including a program information version indicating a version status of the program information and a program information map including a set of information records used to allow the client device to identify a program to be delivered at the version status and to reproduce the program, and updates the program information depending on a version change of the version status. The client device updates currently saved program information when a version status included in the currently saved program information is different from the version status of the delivered program information, by obtaining the program information delivered from the program information server.