A method for downloading data associated with a recording medium from an external source, and reproducing data recorded in the recording medium is disclosed. A method for reproducing data from a recording medium in a player equipped with a network device (i.e., a Network Equipped Player) includes the steps of: a) if the recording medium is loaded, transmitting network configuration information and identification (ID) information of the loaded recording medium to a content provider (CP); b) downloading data associated with the recording medium from the content provider (CP) over a network; and c) reproducing data transmitted over the network and data recorded in the recording medium.