The present invention relates to a viewing window evaluation system that can analyze the sound source data recorded by the user to compare with the original sheet music and the viewing window evaluation method using the same. To this end, the present invention comprises the steps of loading the sound source data recorded by the user to the server; Analyzing the pitch and length of the sound source data by an analysis module; The step of displaying the pitch and length analyzed by the display module as a note, The analysis module, A dividing step of dividing the sound source data into voice cells having a predetermined length; A conversion step of converting the divided voice cell into a frequency domain through Fourier transform; It provides a sight glass evaluation method for performing the step of storing in an array based on the maximum frequency value. Therefore, according to the present invention, the user can see the sheet music and practice the sight without having a separate instrument such as a piano.
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