A computer-implemented simulation method for simulating the deformation of a filler compound in which a filler is dispersed and mixed in a matrix using the finite element method, wherein the matrix includes rubber or an elastomer and the filler is carbon black or silica, the method comprising: the step of obtaining a microscopic image containing matrix rubber and the filler using a transmission electron microscope; defining a simulation-model forming space so as to include the matrix and the filler based on the microscopic image; processing the simulation-model forming space to extract an edge of the filler; and building a simulation model of the filler compound by partitioning the simulation-model forming space (j) into a filler region and a non-filler region so as to determine a boundary between these regions based on the edge of the filler; setting a filler model by dividing the filler region into a finite number of elements (2a-2d); dividing the non-filler region into a finite number of elements; and then setting at least one element among the elements of the non-filler region as an interface model, the at least one element being in contact with the filler model; and setting at least one element among the elements of the non-filler region as a matrix model, the at least one element being outside the interface model; defining one or more physical properties for each of the elements of the filler model, each of the elements of the interface model, and each of the elements of the matrix model as computing parameters, wherein said physical properties include at least one of density, modulus of elasticity, hardness and tan δ; and calculating the deformation of the simulation model. the step of obtaining a microscopic image containing matrix rubber and the filler using a transmission electron microscope; defining a simulation-model forming space so as to include the matrix and the filler based on the microscopic image; processing the simulation-model forming space to extract an edge of the filler; and building a simulation model of the filler compound by partitioning the simulation-model forming space (j) into a filler region and a non-filler region so as to determine a boundary between these regions based on the edge of the filler; setting a filler model by dividing the filler region into a finite number of elements (2a-2d); dividing the non-filler region into a finite number of elements; and then setting at least one element among the elements of the non-filler region as an interface model, the at least one element being in contact with the filler model; and setting at least one element among the elements of the non-filler region as a matrix model, the at least one element being outside the interface model; partitioning the simulation-model forming space (j) into a filler region and a non-filler region so as to determine a boundary between these regions based on the edge of the filler; setting a filler model by dividing the filler region into a finite number of elements (2a-2d); dividing the non-filler region into a finite number of elements; and then setting at least one element among the elements of the non-filler region as an interface model, the at least one element being in contact with the filler model; and setting at least one element among the elements of the non-filler region as a matrix model, the at least one element being outside the interface model; defining one or more physical properties for each of the elements of the filler model, each of the elements of the interface model, and each of the elements of the matrix model as computing parameters, wherein said physical properties include at least one of density, modulus of elasticity, hardness and tan δ; and calculating the deformation of the simulation model.