Abstract: In order to analyze a physical target system, a simultaneous equation for the analysis is converted into a first equation in a matrix form to be divided into a plurality of groups. After that, for each group, an unknown vector having connective relation of the adjacent group is added to a constant vector, whereby an addition vector is generated, and a second equations each in the matrix form is generated. The equation having connective relation is extracted from the second equations, thereby generating at least one of compressed third equation in the matrix form. Values of unknowns included in the unknown vector are obtained by using an inverse matrix of a coefficient matrix. These values are substituted into the second equations, thereby obtaining values of the unknowns included in the simultaneous linear equation. These values are outputted as an analysis result of the target system.