| 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. |
