1. A method of displaying a content data and a language formatted data associated with the content data, the method performed by a reproducing device and comprising: receiving a broadcast signal stream through an antenna; receiving a selecting signal for selecting a specific channel service; selecting a specific transport stream from the broadcast signal stream according to the selecting signal, the specific transport stream corresponding to the specific channel service, the transport stream including content data stream consisting of at least one content segmented unit having a first identifier and a first presentation time information; receiving a language formatted data stream consisting of at least one language formatted segmented unit having a second identifier and a second presentation time information; associating the content segmented unit and the language formatted segmented unit with each other using a linking information, wherein the linking information assigns reference information to the content data for associating the content data with the language formatted data; decoding the associated content segmented unit at a specific time determined by the first presentation time information included in the content segmented unit; decoding the associated language formatted segmented unit in a synchronous manner with the content segmented unit using the second presentation time information included in the language formatted segmented unit; and displaying the decoded content segmented unit and the decoded language formatted segmented unit.