A reproducing apparatus comprises: a read unit for reading an information data file storing information data and an index file relating to the information data file, from a recording medium; a communication unit for transmitting the data file read by the read unit to an external apparatus for processing the data file in accordance with a predetermined file system; a conversion unit for converting the index file into a structure corresponding to the predetermined file system and generating conversion index information; and a control unit for controlling the communication unit to transmit the conversion index information in response to a data transmission request from the external apparatus.