A computerized method for simulating deformation of a rubber compound with filler particles comprises: a step in which a pseudo-two-dimensional rubber compound model of the rubber compound is generated; a step in which a deformation calculation is performed by the use of the pseudo-two-dimensional rubber compound model; and a step in which a necessary physical quantity is acquired from the deformation calculation. The pseudo-two-dimensional rubber compound model comprises a model of a rubber matrix and a plurality of models of filler particles. The pseudo-two-dimensional rubber compound model has a small thickness and has the same cross section in succession in the thickness direction.