GROUPING SYSTEM AND RECOMMENDED-PRODUCT DETERMINATION SYSTEM

摘要

Provided is a grouping system capable of defining a product group so as to make it possible to ascertain a group of products likely to be purchased at the same time. A storage means 71 at least stores the purchasing context, which is information indicating the one or more types of products purchased during a single purchasing activity. A grouping means 72 determines a purchasing context group, a product group, and a purchasing history distribution parameter, by using the likelihood of combinations of purchasing context groups, product groups, and purchasing history distribution parameters. Said likelihood is calculated by using the purchasing history corresponding to combinations of the purchasing context groups and the product groups, and the purchasing history distribution parameters.