INFORMATION PROCESSING SYSTEM

Provided is an information processing system that, when a shopper purchases a product displayed in a shop, enables the automation of the purchase of the product and reduces the time required for purchasing the product.This information processing system comprises a moving object tracking means, a shelf product recognition means, and a purchase means. The moving object tracking means identifies moving objects, such as shoppers and baskets, that are moving through a shop, defines the region of the moving object, and picks up images while tracking the moving object. The shelf product recognition means constantly picks up images of the state of the shelves, compares images picked up before and after an object is taken from a shelf, defines the region from the picked up image of a recognized product, and identifies the product from the defined image region. The purchase means purchases the identified product.