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This paper proposes an effective approach for the maintenance of a frequent-itemset lattice in incremental mining based on the pre-large concept. First, the building process of a frequent-itemset lattice is improved using a proposed theorem regarding the paternity relation between two nodes in the lattice. Then, based on the pre-large concept, an approach for maintaining a frequent-itemset lattice with dynamically inserted data is proposed. The experimental results show that the proposed approach outperforms the batch approach for building the lattice in terms of execution time.