A frequency distribution monitor unit partitions, into a plurality of classes, a size of a vertical component of a motion vector, and detects a frequency of the number of occurrences at which the vertical component occurs in each of the classes. In a case where the vertical component of the motion vector exceeds a predetermined threshold value in predetermined specific classes, the offset control unit creates offset signals which shift read addresses in the vertical direction in delay units. A selection control unit controls to shift, in the vertical direction, pixel data selected by delay selection units.