It is now possible to correct flicker without the risk of correcting flicker by error if a moving subject exists in the scene by using values detected in the past in order to prevent degradation of image quality from taking place. The integral value obtained by integrating an input video signal that includes a flicker component over not less than a horizontal period and the difference value between integral values of adjacent fields or frames is normalized. Then, the amplitude component and the phase component of the flicker component are estimated. A flicker coefficient for canceling the amplitude component and the phase component of the flicker component estimated is generated on the basis of the probability of being under the lighting of a fluorescent lamp. The flicker coefficient and the input video signal are computationally determined to obtain a video signal with a reduced flicker component.