Multiplexing device and data processing method thereof

A multiplexing device which receives input of a plurality of pieces of data and multiplexes the same, comprising:

• a data conversion unit which receives input of at least one of said plurality of pieces of data and executes segmentation or concatenation processing with respect to the data as required to output data which fails to exceed a predetermined limited size and which is delimited by a delimitation of a predetermined data unit;
• a plurality of adaptation units which are disposed in plural corresponding to said plurality of pieces of data and output data from said data conversion unit to provide corresponding said data with a function of an adaptation layer according to properties of the data;
• and
• a multiplexing layer unit which multiplexes a plurality of pieces of data from said plurality of adaptation units and sends out the multiplexed data.