A simulation apparatus, using the moment method and at high speed, simulates the intensity of an electromagnetic field, etc. of a time domain. A transforming unit obtains a frequency spectrum by segmenting time series data of a wave source and applying a Fourier transform thereto. A calculating unit calculates the mutual impedance at a sampling frequency, generates an approximate expression of the mutual impedance from the calculated mutual impedance and the sampling frequency and calculates the mutual impedance at respective frequencies obtained by the transforming unit by using the generated approximate expression. A simulating unit finds a current spectrum flowing in each element, according to the moment method, from the mutual impedance calculated by the calculating unit and the frequency spectrum obtained by the transforming unit and finds the spectrum of a voltage, an electric field, and a magnetic field from the found current spectrum. An inverse transforming unit applies an inverse Fourier transform to the spectra found by the simulating unit and outputs the result.
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