A computer-implemented method for estimating a distribution of a frequency response of a transfer system based on original information and degraded information obtained as a result of transfer of the original information in the transfer system, comprising: a step of identifying a distribution of the degraded information represented by a probability density function; a step of identifying a spectrum distribution of a distribution of the original information by applying a Fourier transform to the distribution of the original information which is represented by a probability density function; a step of identifying an initial estimated distribution of an impulse response of the transfer system, wherein the impulse response is the probability density function representing the distribution of the degraded information when the distribution of the original information is represented by a unit impulse function; a step of acquiring a first function by applying a Fourier transform to the estimated distribution of the impulse response; a step of acquiring a second function by multiplying the first function by the spectrum distribution of the distribution of the original information; a step of acquiring a third function by applying an inverse Fourier transform to the second function; a step of acquiring a fourth function by dividing the distribution of the degraded information by the third function; a step of acquiring a fifth function by applying a Fourier transform to the fourth function; a step of acquiring a sixth function by multiplying the fifth function by the function of the spectrum distribution of the distribution of the original information with all of its one or more arguments having opposite sign; a step of acquiring a seventh function by applying an inverse Fourier transform to the sixth function; 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 to; 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. a step of identifying a distribution of the degraded information represented by a probability density function; a step of identifying a spectrum distribution of a distribution of the original information by applying a Fourier transform to the distribution of the original information which is represented by a probability density function; a step of identifying an initial estimated distribution of an impulse response of the transfer system, wherein the impulse response is the probability density function representing the distribution of the degraded information when the distribution of the original information is represented by a unit impulse function; a step of acquiring a first function by applying a Fourier transform to the estimated distribution of the impulse response; a step of acquiring a second function by multiplying the first function by the spectrum distribution of the distribution of the original information; a step of acquiring a third function by applying an inverse Fourier transform to the second function; a step of acquiring a fourth function by dividing the distribution of the degraded information by the third function; a step of acquiring a fifth function by applying a Fourier transform to the fourth function; a step of acquiring a sixth function by multiplying the fifth function by the function of the spectrum distribution of the distribution of the original information with all of its one or more arguments having opposite sign; a step of acquiring a seventh function by applying an inverse Fourier transform to the sixth function; 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 acquiring a first function by applying a Fourier transform to the estimated distribution of the impulse response; a step of acquiring a second function by multiplying the first function by the spectrum distribution of the distribution of the original information; a step of acquiring a third function by applying an inverse Fourier transform to the second function; a step of acquiring a fourth function by dividing the distribution of the degraded information by the third function; a step of acquiring a fifth function by applying a Fourier transform to the fourth function; a step of acquiring a sixth function by multiplying the fifth function by the function of the spectrum distribution of the distribution of the original information with all of its one or more arguments having opposite sign; a step of acquiring a seventh function by applying an inverse Fourier transform to the sixth function; 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 to; 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.