1. An image processing system for generating a stereoscopic image that is stereoscopically visible, the image processing system comprising one or more computer processors configured to perform at least: stereoscopic image generation by taking images of a virtual three-dimensional space in which an object is located, with a virtual camera, generating a stereoscopic image that is composed of an image for a left eye and an image for a right eye between which a disparity is provided; and display control by causing a display section to display the generated stereoscopic image, the stereoscopic image generation performing correction of decreasing a disparity of the object, wherein in generating the stereoscopic image, the stereoscopic image generation performs correction of decreasing a disparity of an object in accordance with a distance from the virtual camera to the object, wherein in generating the stereoscopic image, the stereoscopic image generation performs correction of more greatly decreasing the disparity of the object when the distance from the virtual camera to the object is shorter such that the positional relation among different objects in the depth direction is not inverted, wherein in generating the stereoscopic image, the stereoscopic image generation performs at least one of a correction of moving a position of the object in the image for a left eye in a leftward direction as seen from a user, and correction of moving a position of the object in the image for a right eye in a rightward direction as seen from the user, thereby performing correction of decreasing the disparity of the object, and wherein in generating the stereoscopic image, by using a left virtual camera for taking the image for a left eye, a right virtual camera for taking the image for a right eye, and an intermediate virtual camera located between the left virtual camera and the right virtual camera, the stereoscopic image generation performs at least one of a correction of adjusting a position of an object in the image for a left eye such that the position is located between a position based on the left virtual camera and a position based on the intermediate virtual camera, and a correction of adjusting a position of the object in the image for a right eye such that the position is located between a position based on the right virtual camera and the position based on the intermediate virtual camera, thereby performing correction of decreasing the disparity of the object.