a psi converter includes : a protocol data extractor , a protocol data converter , a protocol data inserter , and a system controller . the protocol data extractor is configured for demultiplexing a terrestrial broadcasting ts or a satellite broadcasting ts , and extracting audio / video data and psip / psi data or audio / video data and si / psi data from the terrestrial broadcasting ts or the satellite broadcasting ts , respectively . the protocol data converter is configured for converting the psip / psi data or the si / psi data into psip / psi data of a corresponding digital cable television broadcasting standard . the protocol data inserter is configured for inserting the digital cable television broadcasting standard psip / psi data into the audio / video data extracted by the protocol data extractor though ts multiplexing , and generating a digital cable broadcasting ts . the system controller is configured for checking the protocol data extractor , the protocol data converter , and the protocol data inserter , and controlling their operation .