1. An electromagnetic field simulation apparatus, comprising: a data generating unit that, by replacing a predetermined region in printed circuit board CAD data to be subjected to an electromagnetic field simulation with measurement data measured by a near-field measurement device, generates new printed circuit board CAD data; a wave source setting unit that, regarding a measurement data portion in the new printed circuit board CAD data generated by the data generating unit, generates analysis model data by setting, as a wave source, an electric field or a magnetic field measured by the near-field measurement device; and a simulation executing unit that executes the electromagnetic field simulation with respect to the analysis model data having a wave source set by the wave source setting unit.