| 摘要 |
A means for achieving better actual results of sales by preventing a user from duplicating purchase of goods or presenting goods satisfying a personal need. A novel solution means compares its own list with a comparison object list and displays an item existing on the comparison object list but not existing on its own list such that it can be discriminated on the comparison object list, or displays an item existing on its own list but not existing on the comparison object such that it can be discriminated on its own list.
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