Apparatuses and method for recommending items based on determined trend leaders and trend followers

摘要

A server apparatus includes: a trend leader detecting portion that acquires purchaser identifying information for identifying a purchaser who purchased the product at an early stage satisfying a predetermined time condition, from at least two pieces of purchase history information; a recommended product acquiring portion that acquires at least one piece of product identifying information for identifying a product purchased by at least one purchaser identified with at least one piece of purchaser identifying information that has been acquired by the trend leader detecting portion; and a recommended product transmitting portion that transmits the at least one piece of product identifying information that has been acquired by the recommended product acquiring portion, to an information output apparatus. With this server apparatus, recommendation of a product can be provided based on the behavior in which a trend leader purchases a product.