1. A method for selecting an audio language of a digital broadcasting receiver by detecting and updating a PMT including audio track information, from an input digital broadcasting stream, the method comprising: determining whether an audio language, of available audio languages of a data stream, has been selected for reproduction by the digital broadcasting receiver; increasing a current audio language on-screen display order number, in a current on-screen audio language index, by one, when the audio language has been selected; setting a previous audio language on-screen display order number to equal a value of the increased current audio language on-screen display order number and storing the increased current audio language on-screen display order number in the current audio language index; displaying the current audio language index having the increased current audio language on-screen display order number; fetching a new current audio language index, and setting the current audio language on-screen display order number to correspond to the new current audio language index; comparing the previous audio language on-screen display order number with the current audio language on-screen display order number; displaying the new current audio language index, setting the previous audio language on-screen display order number to equal the value of the current audio language on-screen display order number, and then returning to the operation of determining of whether an audio language selection has been made when the previous audio language on-screen display order number and current audio language on-screen display order number are different; and returning to the operation of determining of whether an audio language selection has been made when the previous audio language on-screen display order number and current audio language on-screen display order number are the same.