A method of computing an energy loss generated in a viscoelastic material,
including analyzing a dynamic behavior of a to-be-analyzed object
composed of the viscoelastic material by a numerical analysis method; and
computing the energy loss of the object momently when the object makes
the dynamic behavior by a viscous component of the object. The energy
loss computed by the energy loss computing method is visualized by a golf
ball-hitting simulation to momently evaluate the energy loss generated in
the golf ball.