9. A filtering method used for a local terminal search system, the filtering method comprising: at a computing device including a processor and a memory; collecting file information stored in a local terminal; determining whether a file corresponding to the collected file information is a complex-structured file, the complex-structured file being defined as a file that requires more than a prescribed threshold time for filtering of the file; filtering by said processor the file corresponding to the collected file information if the corresponding file is not a complex-structured file; extracting by said processor information required for filtering of the corresponding file to generate preprocessed information segments if the corresponding file is a complex-structured file; combining the generated preprocessed information segments to generate a preprocessed file; and storing the generated preprocessed file in a snapshot database; filtering by said processor the preprocessed file during a period of time in which the processor can afford to perform the filtering; indexing each filtered file to provide indexed data; storing the indexed data in an index database, wherein the extracting of the information required for filtering of the corresponding file is for a prescribed time and a corresponding preprocessing process terminates if the prescribed time has elapsed, wherein the preprocessed information segment comprises at least one segment selected from the group consisting of a file name information segment, an extension information segment, a path information segment, a capacity information segment, a meta information segment, and a capture image information segment.
9. A filtering method used for a local terminal search system, the filtering method comprising: at a computing device including a processor and a memory; collecting file information stored in a local terminal; determining whether a file corresponding to the collected file information is a complex-structured file, the complex-structured file being defined as a file that requires more than a prescribed threshold time for filtering of the file; filtering by said processor the file corresponding to the collected file information if the corresponding file is not a complex-structured file; extracting by said processor information required for filtering of the corresponding file to generate preprocessed information segments if the corresponding file is a complex-structured file; combining the generated preprocessed information segments to generate a preprocessed file; and storing the generated preprocessed file in a snapshot database; filtering by said processor the preprocessed file during a period of time in which the processor can afford to perform the filtering; indexing each filtered file to provide indexed data; storing the indexed data in an index database, wherein the extracting of the information required for filtering of the corresponding file is for a prescribed time and a corresponding preprocessing process terminates if the prescribed time has elapsed, wherein the preprocessed information segment comprises at least one segment selected from the group consisting of a file name information segment, an extension information segment, a path information segment, a capacity information segment, a meta information segment, and a capture image information segment. 12. The filtering method of claim 9 , further comprising: determining whether or nor the filtering is in progress; wherein a corresponding search request is processed after waiting until the filtering is completed if the determination is that the filtering is in progress.