1. A processor processing method, suitable for a processor system, wherein the processor system comprises a CPU, a ROM coupled to the CPU, and a DSP having a memory unit for storing programs and a processor unit for processing data according to the programs, the method comprising the steps of: storing a plurality of programs and parameters required for processing the programs to the ROM; downloading an initial program from the CPU to the memory unit of the DSP when a power is turned on; transferring the programs and the parameters corresponding to each process request from the system processor external from the ROM to the memory unit of the DSP; inputting data to be processed from the system processor external to the DSP; processing the data by the processor unit based on the programs and the parameters that are transferred to the memory unit; and outputting the processed data to the system processor external.