1. A frame rate conversion apparatus that converts a frame rate of a synthesized moving image which is a moving image synthesized with a still image, by inserting an interpolation frame between frames of the synthesized moving image, the apparatus comprising: a detection unit that generates motion information by detecting motion of picture at each pixel location from a moving image which is not synthesized with a still image; a synthesizing unit that generates a synthesized moving image by synthesizing a still image on a blending region in the moving image at a prescribed opacity; a judgment unit that determines whether or not a pixel of interest of an interpolation frame to be inserted between frames of the synthesized moving image generated by the synthesizing unit is a pixel within the blending region; and a generation unit that generates the interpolation frame, wherein the generation unit sets a value of a pixel at the same location as the pixel of interest in a frame of the synthesized moving image before or after the interpolation frame to the pixel of interest in a case where the pixel of interest of the interpolation frame is determined to be pixel within the blending region, and sets a value of the pixel of interest based on a value of a corresponding pixel at a location specified by motion information corresponding to the pixel of interest in at least one of frames of the synthesized moving image before and after the interpolation frame in a case where the pixel of interest of the interpolation frame is determined to not be within the blending region.