1. A moving image processing device comprising: a frame data acquisition unit configured to acquire frame data in which a parallax image for the left eye and a parallax image for the right eye are arranged across an active space; an image processing unit configured to subject the frame data to image processing; and an active space setting unit configured to identify the position of the active space processed by the image processing unit and to set the pixel values of the active space to be fixed values, wherein the position of the active space is determined using a vertical synchronization signal and a horizontal synchronization signal, wherein the fixed active space values are used to display the parallax image regardless of a distorted active space value that is determined during image processing, and wherein the active space setting unit sets the pixel values of the active space to be fixed values after the image processing unit has subjected the frame data to image processing.