| 摘要 |
PROBLEM TO BE SOLVED: To ensure the number of recommendable items to maintain precision of recommendation while reducing computational effort.SOLUTION: A selected use relevant information creation section performs the steps of: referring to a storage section storing use relevant information in which user identifiers, item identifiers and use period information are associated; and selecting selected use relevant information that is at least part of plural pieces of use relevant information associated with an item identifier, for each item identifier, on a condition that more pieces of selected use relevant information would be selected when the number of pieces of use relevant information including use period information that is close to a specific point in time is larger. An association calculation section calculates a degree of association between one item identifier and an other item identifier on the basis of selected use relevant information on the one item identifier and selected use relevant information on the other item identifier. |
