Abstract: A digital television middleware, comprising: an application program description information finding unit for requesting application program description information from a first network and a second network; an application program description information converting unit for converting the received application program description information for the second network into description information in a format of an application program information table (AIT) which can be used by the first network; and an AIT table buffering unit for buffering the converted description information so as to download the requested application program description information for the second network used by the first network.

Abstract: A method for generating keywords of TV programs in Electronic Program Guide (EPG) includes generating keyword information describing characteristics of TV programs in EPG in accordance with the digital video broadcast service information specification, editing service information containing keywords of TV programs at transmitting side, and transmitting the EPG containing the generated keyword information. An easy-to-use program search experience is available to users, upon the condition that the electronic programs are edited in complying with DVB-SI standard specification, the keyword information is configured according to the invention, and EPG interpretation applications at the receiver side further extract and analyze the keyword information accordingly.