An image signal (D2) of each frame is subjected to image correction processing (6, 16) using a detected motion vector (V). On the basis of a high-frequency component of the detected motion vector (V), a determination is made (9) regarding the reliability of the motion vector detection result in each frame, and when the reliability of the motion vector is poor, the image is outputted without being subjected to image correction processing. Thus, in image correction processing dependent on motion vectors, it is possible to prevent the output of an image of poorer quality than the original image when there are numerous erroneously detected motion vectors.