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 (S1) the simulation-model forming space (j) into a filler region and a non-filler region so as to determine a boundary (E) between these regions based on the edge of the filler; setting (S2) a filler model by dividing the filler region into a finite number of elements (2a-2d); dividing (S3) the non-filler region into a finite number of elements ; and then setting (S4) 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 (S5) 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 (S1) the simulation-model forming space (j) into a filler region and a non-filler region so as to determine a boundary (E) between these regions based on the edge of the filler; setting (S2) a filler model by dividing the filler region into a finite number of elements (2a-2d); dividing (S3) the non-filler region into a finite number of elements ; and then setting (S4) 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 (S5) 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 (S1) the simulation-model forming space (j) into a filler region and a non-filler region so as to determine a boundary (E) between these regions based on the edge of the filler; setting (S2) a filler model by dividing the filler region into a finite number of elements (2a-2d); dividing (S3) the non-filler region into a finite number of elements ; and then setting (S4) 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 (S5) 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 . <EOS>