1. A method for estimating a distribution of a frequency response of a transfer system based on original information and degraded information, comprising: a step of identifying a distribution of the degraded information; a step of identifying a spectrum distribution of a distribution of the original information; a step of identifying an initial estimated distribution of an impulse response of the transfer system; (1) a step of acquiring a first function by applying a Fourier transform to the estimated distribution of the impulse response; (2) a step of acquiring a second function by multiplying the first function by the spectrum distribution of the distribution of the original information; (3) a step of acquiring a third function by applying an inverse Fourier transform to the second function; (4) a step of acquiring a fourth function by dividing the distribution of the degraded information by the third function; (5) a step of acquiring a fifth function by applying a Fourier transform to the fourth function; (6) a step of acquiring a sixth function by multiplying the fifth function by an inverse function of the spectrum distribution of the distribution of the original information; (7) a step of acquiring a seventh function by applying an inverse Fourier transform to the sixth function; (8) a step of acquiring a next estimated distribution of the impulse response by multiplying the estimated distribution of the impulse response by the seventh function; a step of replacing the estimated distribution of the impulse response by the next estimated distribution of the impulse response, and repeating said steps (1) to (8); and a step of applying a Fourier transform to the estimated distribution of the impulse response to acquire and output the distribution of the frequency response of the transfer system.