1. A data processing apparatus comprising: a plurality of signal processing units, each signal processing unit including a register that stores intrinsic identification (ID) information and stores a parameter to be used for a signal processing operation, the signal processing units connected to one another and operative to transmit data signals in a predetermined sequential order and to select any one of a first processing operation of storing the parameter in the register based on an input data signal and a second processing operation of sequentially processing input data signals using the parameter in response to an input mode control signal; a storage unit that stores parameter information indicating parameters to be stored in the respective signal processing units and that stores processing data to be processed by the plurality of signal processing units; a data reading unit that selects the parameter information or the processing data from the storage unit, reads the parameter information or the processing data, and outputs a data signal corresponding to the read data to an initial signal processing unit out of the plurality of signal processing units; a data writing unit that selectively writes data corresponding to a data signal output by a final signal processing unit out of the plurality of signal processing units in the storage unit; and a control unit that outputs the mode control signal instructing each of the plurality of signal processing units to select any one of the first and second processing operations, leads the data reading unit to selectively read data, and leads the data writing unit to selectively write data, wherein when the first processing operation is performed, each of the signal processing units determines whether the input data signal corresponds to the ID information and writes a parameter included in the data signal in the register when the input data signal corresponds to the ID information.