10. A search-based word segmentation device for a language without a word boundary tag, comprising: at least one search engine, adapted to receive a segment of a text comprising at least one segment, to search in a search network for the segment, and to return search results each including candidate word segmentation units; and a word segmentation result generating means, adapted to select a word segmentation approach for the segment in accordance with at least part of the returned search results by extracting, from the at least part of the returned search results, all candidate word segmentation units appearing in the segment; scoring the extracted candidate word segmentation units; ranking subsets of extracted candidate word segmentation units in accordance with the scoring, wherein the candidate word segmentation units in each subset sequentially form the segment; and selecting a highest-ranked subset as the word segmentation approach for the segment.
18. The device according to claim 10 , wherein, when the search engine is a self-maintained search engine, the word segmentation result generating means is adapted to use information provided from an indexing table to view adjacencies of positions of terms in a document to obtain a word segmentation unit.