Method and apparatus for reproducing data and method for transmitting data

The present invention relates to a data reproducing method and a reproducing apparatus for reproducing data recorded on a recording medium together with the download of the data relevant to the recording medium from an external recording medium. The present invention includes the steps of transmitting to the content provider a speed level of the information and local storage for identifying the recording medium; Receiving the data for from the content provider information and the speed level for identifying the recording medium, downloaded to the local storage; It provides a data reproducing method comprising the steps of: reproducing with the data recorded in the downloaded data and the recording medium. Optical discs, BD, HD-DVD, a local storage