In this era of globalization and the Internet, it is increasingly important to find ways of quickly and effectively retrieving the information you need from the enormous flood of information. Of the information retrieval systems currently available, full-text search systems provide an extremely effective tool for accurately locating documents information. This is because these systems supply or store vast amounts of information in document formats. Even image and audio files can be retrieved as documents through the addition of text descriptions to the files. In an environment where an enormous amount of documentary information is scattered all around the world, the provision of full-text search functions in organizations such as companies and research laboratories. At the same time, adding full-text search functionality when information is published on the Internet allows organizations to provide information dissemination services that are easier to use.
