INFORMATION SEARCH DEVICE, PROGRAM FOR SEARCH, METHOD FOR UPDATING DATABASE, DATABASE-UPDATING DEVICE, AND PROGRAM FOR UPDATING DATABASE

摘要

The present invention addresses the problem of speeding up a search process. An information search device for searching for, by a computer from among a plurality of items to be searched, an item to be searched (customer identification numbers 1, 2, 3, etc.) that is associated with a related item designated from among a plurality of related items (commodity names a, b, c, d), wherein, when performing, using a database having a data structure having first data in which two or more related items out of the plurality of related items are associated with the same high-order items W, X, Y, Z, second data in which an item to be searched relating to the related items out of the plurality of related items that are associated with the same high-order items is associated with the high-order items, and third data in which the related items not associated in the first data and second data and an item to be searched are associated, a search under a prescribed search condition in which one or more related items are designated from among the plurality of related items, the computer refers to the first data; when it is determined that a high-order item exists with which some or all of the one or more related items are associated, the computer searches at least the second data; and when it is determined that the associated high-order item is nonexistent, the computer searches only the third data.