Abstract: Digital broadcasting for transmitting program data including at least one of digital audio data and digital video data with other information is carried out by using terrestrial waves. The program data, download data corresponding to contents of the program data, and reference information correlating the download data with the program data are multiplexing with each other. The multiplexing signals are transmitted over a specific frequency band.

Abstract: The object of the invention is to provide a transmission method of the digital broadcasting that can be carried out under the digital broadcasting using the terrestrial waves and does not need complicated operations of using GUI screen.

Abstract: A method and document conversion apparatus for converting text of one language or dialect into text of another language or dialect without losing the tag symbols included in the text. The system includes a unit for storing the source text, a unit for storing data which shows the display properties of the source text and the location to which the properties are attached, a unit for converting the text body of the source language into the text body of the target language, a unit for storing the converted text body, a unit for storing information which shows the relations between words in the target text and words in the source text, a unit which processes the target text body and prepares data which shows the display properties of the target text and the location to which the properties are attached, a unit for preparing the target text by attaching tag symbols to the target text, and a display unit for displaying the text.

Abstract: A text compressing apparatus comprising morpheme-parsing unit for taking out words from sentences retrieved from an external storage unit, dictionary retrieving unit for converting the post-morpheme-parse words into form marks indicating the form of the detected words while referring to a parse dictionary, a structure-parsing unit for generating equation trees for each sentence, an expression rewriting unit for rewriting the words which are referred to as nodes into their representative words, an equation converting unit for converting the equation trees written into the representative expressions into words, and Huffman coding unit for converting the words from the equation tree converting unit into strings of bits.