1. A stereoscopic picture generating apparatus comprising: a memory configured to store a first image containing a plurality of partial images and a second image containing a plurality of partial images corresponding respectively to the plurality of partial images contained in the first image; and a processor coupled to the memory, the processor configured to: extract a first position defined as an existing position of a first partial image contained in the first image and a second position defined as an existing position of a second partial image contained in the second image, the second partial image corresponding to the first partial image; calculate a first differential quantity defined as a difference between the first position and the second position; generate a third image by translating the second image by the first difference quantity; extract a third position defined as an existing position of a third partial image contained in the first image; calculate a second differential quantity defined as a difference between the first position and the third position; calculate a fourth position, defined as a new existing position of a fourth partial image, by translating the second image by the second differential quantity, the fourth partial image being contained in the third image, the fourth partial image corresponding to the third partial image; generate a fourth image where the fourth partial image is located at the fourth position; and generate a stereoscopic picture based on the first image and the fourth image.