The research of ocean waves has been important, not changing since the Age of Great Voyages, because we can't still get the complete knowledge of them. The objective of this research is to develop the fast calculation process of ocean waves, which includes the customized hardware as well as the software algorithm. The authors have realized the real time simulation of many types of ocean waves by the parallel computing system which consists of a PC (Personal Computer) and DSPs (Digital Signal Processor). The real time wave synthesis executing in DSPs is also developed. The methods are applied to a wave simulator as well as a wave maker.