1. A modeling method comprising: selecting a portion of an art work data of a target object having elements, said portion forming an extraction target region that becomes a target for extracting parameters to be used to analyze a high-frequency transmission, said art work data including a layout of the elements of the target object; deleting non-extraction target elements within the extraction target region, that are isolated from extraction target elements within the extraction target region by a power or ground layer and do not affect an electromagnetic analysis of the elements, said extraction target elements being elements that are to be extracted and affect the electromagnetic analysis; linearizing, from among the extraction target elements, a curved wiring; optimizing a wiring length of the extraction target region including the linearized wiring and optimizing an analyzing space dimension of the extraction target region, in order to create a three-dimensional analysis model of the target object; and extracting the parameters by analyzing the three-dimensional analysis model.