Method for retrieving text information of digital television

The embodiment of the invention discloses a method for retrieving texts of a digital television. The method comprises the following steps of: a, dividing all the contents corresponding to the texts of the digital television into at least two categories, and establishing keywords for each category; b, setting up a bouquet association table (BAT) according to the texts, and establishing a service group ID for each category; c, searching an electronic program guide (EPG) text or an event information table (EIT) to match the description of all the current texts and words with the keywords and adding the IDs of the texts successfully matched into transport stream (TS) descriptors of corresponding service groups in the BAT according to the word category of the keywords; d, packaging the finished BAT into TS stream for transmission; and, e, determining all the words successfully matched so as to remove all the channel IDs from each text type service group in the BAT, and returning to step C. By the implementation of