1. A system comprising a shooting system with a plurality of shooting sections and a playback system configured to generate a 3D image based on a signal supplied from the shooting system, wherein the shooting system includes: first and second shooting sections, each of which is configured to shoot an image of a subject; a disparity calculating section configured to generate a differential image representing a difference between first and second images that have been shot by the first and second shooting sections, respectively; and an image output section configured to output the first image and the differential image, and wherein the playback system includes an image generating section configured to get the first image and the differential image and generate, based on the differential image and the first image, a third image that has as high a resolution as the first image and that forms, along with the first image, a 3D image, and wherein the image generating section generates, based on the first image and the differential image, a depth map representing the amount of parallax between the first and second images, and also generates the third image based on the first image and the depth map, wherein the image generating section is controlled to determine whether or not to generate the third image based on at least one of a zoom power during shooting and the roll angle of the image capture of device during shooting.