1. A local terminal search system that searches information stored in a local terminal, the system comprising: a search request processing unit configured to receive search request information and to provide the search result information to a user; a search/index unit configured to construct an index database by indexing information stored in the local computer and to search said index database using a search keyword in association with the search request information, the search/index unit receiving the search request information from the search request processing unit; a filtering unit, the filtering unit collecting information of files stored in the local terminal, the filtering unit filtering the files, and the filtering unit providing the filtered information to said search/index unit for indexing, wherein the filtering unit filters files if the files are not complex-structured files, and the complex-structured file being defined as a file that requires a prescribed threshold time or more for filtering of the file; and a complex-structured file preprocessing unit configured to extract information required for filtering the file corresponding to the file information collected by the filtering unit to generate preprocessed information segments if the corresponding file is a complex-structured file, wherein a preprocessed file generated by combining the preprocessed information segments is stored in a snapshot database and the filtering unit performs filtering of the preprocessed file stored in the snapshot database.