Jeong-Joon Kim, Don-Hee Lee, Jeong-Min Park, Document Similarity Measurement Systems used S-W Algorithm on Smart Phone, Journal of Engineering and Applied Sciences, Volume 12,Issue 10, 2017, Pages 2655-2661, ISSN 1816-949x, jeasci.2017.2655.2661, (https://makhillpublications.co/view-article.php?doi=jeasci.2017.2655.2661) Abstract: Recently, the importance of intellectual property rights is emphasized but search and browse the document using the smart phone is rapidly increasing, the program can know such as the degree of similarity between documents is only enough reliability not has not been carried out correctly in conjunction between the document holding the document and the web. Thus, in this study S-W by applying the method of preprocessing algorithm by reducing the entire data it was confirmed that the search time is shortened. In addition by eliminating the overlapping portion at the time of inspection to verify that the search time is shortened. It should be noted that by implementing in the smart phone application, increased the ease of use and portability. Keywords: S-W algorithm;document similarity;levenshtein;smart phone;portion