A computer program causes an object tracking device to realize functions of: acquiring a first image of a scene including an object captured with a camera positioned at a first position; deriving a 3D pose of the object in a second image captured with the camera positioned at a second position using a 3D model corresponding to the object; deriving 3D scene feature points of the scene based at least on the first image and the second image; obtaining a 3D-2D relationship between 3D points represented in a 3D coordinate system of the 3D model and image feature points on the second image; and updating the derived pose using the 3D-2D relationship, wherein the 3D points include the 3D scene feature points and 3D model points on the 3D model.