To provide a fluid numerical value computing method, which is usable as an efficient general-purpose numerical value computing method causing less numerical value diffusion and not depending on a function type of a state equation, a fluid numerical value computing device, a control program, and a storage medium.

In computing an equation for a storage type, a flux is separated according to its physical characteristics, and time development is carried out by using windward differential and central differential type leapfrog differential methods at the same time.