1. A consensus search device comprising: a semantic data indexing unit configured to divide text data of an electronic document written about at least one object into segments, to extract at least one semantic descriptor from the each segmented text data, and to generate a semantic data index matching each of the extracted semantic descriptor to the object and the each segmented text data; and a semantic searching unit configured to retrieve an object related to a query, based on the semantic data index, wherein the text data is divided into the segments by units of meaning.