Searching for information on the Internet is not only an essential way to get information, but also a strategic tool to obtain a wide variety of information. Unfortunately, Web is so huge and so unstructured that the collection of specific, fair and useful information becomes a daunting ant time-wasting task. To define information research tool (metasearch engine) which has the aim to combine several sources of information, the main interest should be brought to the fusion step of results from search engines.