A motion vector detector detects a motion vector, and generates reliability data of the motion vector. Pixel selectors select pixels for dynamic interpolation and pixels for static interpolation. The mixing ratio generator generates a first mixing ratio of interpolation pixels of the dynamic interpolation and interpolation pixels of the static interpolation based on the reliability data. A mixing ratio generator generates a second mixing ratio based on a difference value between the pixels for the dynamic interpolation. A mixing ratio adjuster adjusts the mixing ratio so that the mixing ratio of the interpolation pixels of the static interpolation becomes larger to generate a third mixing ratio. An interpolation data generator mixes the interpolation pixels of the dynamic interpolation and the static interpolation with each other in response to the third mixing ratio.