A parallax image conversion apparatus according to an embodiment includes: a first multiple parallax image generation unit configured to generate a first multiple parallax image concerning a first image signal; a second multiple parallax image generation unit configured to receive a second image signal, depth information, and blend information concerning an OSD image, change the blend information based on the depth information, and generate a second multiple parallax image concerning the OSD image based on the second image signal and the depth information; and a compounding unit configured to compound the first multiple parallax image and the second multiple parallax image by using the changed blend information.