The optical property constant measuring method includes a dividing step (S106) of setting a plurality of first segments by virtually dividing an optical transmission medium along a propagation direction, and an input optical signal of each intensity having a plurality of first segments. A first estimation step (S108 to S114) for estimating the optical property constants of each of the plurality of first segments based on the result of the first propagation simulation by the model that sequentially propagates, and in the first estimation step, measurement is performed. The optical property constant of each of the plurality of first segments is searched using an evaluation function that evaluates the difference between the power spectrum of the output optical signal and the power spectrum of the output optical signal obtained as a result of the first propagation simulation. To estimate the optical property constant of each of the plurality of first segments.
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