该方法将文档中词频出现两次以上的词条作为文档的摘要信息，来表示节点文档内容，然后根据改进的STC算法为选出的词条建立了一个树状的层次结构。
In this method , words which appear more than twice are picked up to represent the content of the nodes , and then improved STC algorithm is employed to build a hierarchical structure with the selected words .
次词条