ITEM RECOMMENDATION SYSTEM, METHOD, AND PROGRAM

PROBLEM TO BE SOLVED: To provide an item recommendation system, method and program capable of decreasing the number of items whose recommendation scores are calculated and reducing a calculation cost and processing load for item recommendation.SOLUTION: An item recommendation system 1 comprises: a purchase information acquisition means 10 to acquire purchase information of each item and store the information in a purchase information storage means 61; an item selection rate calculation means 20 to determine a category of each purchase information, use the category to calculate an item selection rate of each item for each category, and store the item selection rate in an item selection rate storage means 63; a candidate item determination means 30 to use the item selection rate to extract a candidate item for each category and store the candidate items extracted from all of the categories in a candidate item storage means 64; and a recommendation list creation means 40 to use the item selection rate and the purchase information to calculate a recommendation score of each candidate item for each user, select a recommendation item for each user on the basis of the recommendation score to create a recommendation list, and store the recommendation list in a recommendation list storage means 65.