A method of correcting a representative displacement waveform, comprising: a step of determining a performance curve that is configured, based on frequency analysis of measured acceleration waveform of a seismic wave, to reflect a determined frequency band of the measured acceleration waveform and not to reflect a frequency band other than the determined frequency band, wherein the performance curve is a curve in a coordinate system having a first axis (Sd) of representative displacement and a second axis (Sa), vertical to the first axis, of representative acceleration, each point on the curve providing a value of a representative displacement waveform and a value at the same time of a representative acceleration waveform; and a step of determining an approximation formula approximating the performance curve; characterized in that the method of correcting a representative displacement waveform further comprises: a step of determining a virtual displacement waveform by applying the measured acceleration waveform of the seismic wave to the approximation formula; a step (S32,S33) of determining, through frequency analysis of the virtual displacement waveform, a displacement waveform for correction which reflects at least partially the frequency band other than the determined frequency band; and a step of correcting, in accordance with the displacement waveform for correction, the representative displacement waveform used as a basis for said performance curve. a step of determining a performance curve that is configured, based on frequency analysis of measured acceleration waveform of a seismic wave, to reflect a determined frequency band of the measured acceleration waveform and not to reflect a frequency band other than the determined frequency band, wherein the performance curve is a curve in a coordinate system having a first axis (Sd) of representative displacement and a second axis (Sa), vertical to the first axis, of representative acceleration, each point on the curve providing a value of a representative displacement waveform and a value at the same time of a representative acceleration waveform; and a step of determining an approximation formula approximating the performance curve; characterized in that the method of correcting a representative displacement waveform further comprises: a step of determining a virtual displacement waveform by applying the measured acceleration waveform of the seismic wave to the approximation formula; a step (S32,S33) of determining, through frequency analysis of the virtual displacement waveform, a displacement waveform for correction which reflects at least partially the frequency band other than the determined frequency band; and a step of correcting, in accordance with the displacement waveform for correction, the representative displacement waveform used as a basis for said performance curve. a step of determining a virtual displacement waveform by applying the measured acceleration waveform of the seismic wave to the approximation formula; a step (S32,S33) of determining, through frequency analysis of the virtual displacement waveform, a displacement waveform for correction which reflects at least partially the frequency band other than the determined frequency band; and a step of correcting, in accordance with the displacement waveform for correction, the representative displacement waveform used as a basis for said performance curve.