A quantization control method used in a video encoding which encodes a video image and performs bit-rate control for making an encoding bit rate approach a predetermined target bit rate, wherein the quantization control method comprises the steps of: measuring (S2073) a differential amount of code between a target amount of code and an amount of generated code for a video signal as an encoded target; and determining (S2073) whether or not a predetermined condition, which causes an abrupt change in the amount of generated code, has occurred, determining (S2071, S202) whether or not further predetermined conditions have occurred, determining for each condition (S2072, S2074, S203), when it is determined that the condition has occurred, a variation that is a displacement from a current amount of feedback which is set for the differential amount of code and increases or decreases a quantization step size for the encoding of the video signal; temporarily changing (S2072, S2074, S203) the amount of feedback based on the determined variations while securing the original amount of feedback before the changing; and outputting (S2075) a signal to increase or decrease the quantization step size based on the measured differential amount of code and the changed amount of feedback, wherein the method is characterized in that if there are a plurality of the predetermined conditions, the changing of the amount of feedback includes determining a final variation for the amount of feedback by calculating a sum of increases for the amount of feedback, which are assigned to the individual conditions, and by determining a minimum value between the calculated sum and a set maximum value, as the final variation for the amount of feedback. measuring (S2073) a differential amount of code between a target amount of code and an amount of generated code for a video signal as an encoded target; and determining (S2073) whether or not a predetermined condition, which causes an abrupt change in the amount of generated code, has occurred, determining (S2071, S202) whether or not further predetermined conditions have occurred, determining for each condition (S2072, S2074, S203), when it is determined that the condition has occurred, a variation that is a displacement from a current amount of feedback which is set for the differential amount of code and increases or decreases a quantization step size for the encoding of the video signal; temporarily changing (S2072, S2074, S203) the amount of feedback based on the determined variations while securing the original amount of feedback before the changing; and outputting (S2075) a signal to increase or decrease the quantization step size based on the measured differential amount of code and the changed amount of feedback, wherein the method is characterized in that if there are a plurality of the predetermined conditions, the changing of the amount of feedback includes determining a final variation for the amount of feedback by calculating a sum of increases for the amount of feedback, which are assigned to the individual conditions, and by determining a minimum value between the calculated sum and a set maximum value, as the final variation for the amount of feedback. <EOS>