1. A method for producing, using a computer, a simulation model of a filler compound in which a filler is dispersed and mixed in a matrix, the method comprising: partitioning an simulation-model forming space into a filler region and a non-filler region so as to determine a boundary between these regions; dividing the filler region into a finite number of elements so as to set a filler model; dividing the non-filler region into a finite number of elements; setting, as an interface model, at least one element among the elements of the non-filler region, the at least one element being at least in contact with the filler model; and setting, as a matrix model, at least one element among the elements of the non-filler region, the at least one element being outside the interface model.