1. An image conversion apparatus comprising: a 3D conversion instruction module configured to instruct execution of a 3D conversion required to convert an input image into a 3D image; a determination module configured to determine validity or invalidity of the 3D conversion instruction based on a type of the input image; and a converter configured to convert, based on validity determination of the 3D conversion instruction, the input image into the 3D image in response to the 3D conversion instruction.