The present invention includes: a view angle data detecting section (28) for detecting a view angle, which is the angle of an observer's line of sight with respect to a display section (40) and preparing view angle data; an interpolation video image data preparing section (20) for preparing, on the basis of the view angle data, an interpolation video image data item, which is a video image data item having a gray scale level that is between respective gray scale levels of individual original video image data items for pixels adjacent to each other; and a control signal generating circuit section (16) for selecting, from original video image data items and the interpolation video image data arranged together, video image data items (i) in a number equal to the number of pixels and (ii) at a substantially equal interval.