Abstract: Based on the sufficient analysis of the Korean information search system, this paper investigated the indexing method to improve the search performance. After the advantage and shortcoming of the typical indexing methods such as the noun unit indexing, the morphological analysis indexing, the n-gram unit indexing, the word segmentation unit inflexing and so on, were analyzed in detail, the key factor impacting significantly on the search performance was found by trial and error. At the same time, thirty stop words in Korean, indexing way used to search, and its characteristics were illustrated. Finally, a new indexing method for Korean information search was proposed by taking advantage of every inflexing method. Simulation results show that new method proposed holds the significant performance improvement and is promismg.

Key words: Korean, Morphological analysis, Indexing method, N-gram method, Stop word