1. A 500 megabits-per-second (Mbps) transmission apparatus for use in conjunction with a two pairs (2P) line, comprising: a rate matcher which is configured to match rates of transmission data by mapping transmission data which is received from a gigabit media independent interface (GMII) to a 0.5 GMII; a data converter which is configured to generate four symbol vectors by using the transmission data for which the rates are matched, and to generate reception data by using four symbol vectors which have been parallelized by a symbol vector processor; the symbol vector processor which is configured to serialize the four symbol vectors generated by the data converter into two symbol vectors and to de-serialize two symbol vectors received from a transceiver into the four symbol vectors; and the transceiver which is configured to transmit the two symbol vectors serialized by the symbol vector processor to a hybrid circuit and to transmit two symbol vectors received from the hybrid circuit to the symbol vector processor.