1. A video quality assessing apparatus comprising: a subjective quality estimating part ( 11 ) to receive an undeteriorated reference video signal (RI) and a deteriorated video signal (PI) produced from the reference video signal, calculate video signal feature values for both the signals, and according to a difference between the calculated video signal feature values of the signals, estimate a subjective quality of the deteriorated video signal; a correction information storing part ( 13 ) storing correction information that corresponds to video signal feature values and is used to correct the subjective quality; and a subjective quality correcting part ( 12 , 14 , 15 ) to receive the video signal feature value of the reference video signal, retrieve correction information corresponding to the received video signal feature value from the correction information storing part ( 13 ), and correct the estimated subjective quality according to the retrieved correction information.