1. A computer-implemented method for facilitating a semantic search based on one or more previously analyzed and indexed corpuses of natural language texts, the method comprising: identifying on one or more previously analyzed and indexed corpuses of natural language texts, each corpus including a plurality of sentences and indexes of their syntactic and semantic structures where indexes of said syntactic and semantic structures include indexes of meanings of linguistic categories (“parameters”) of the sentences and of their lexical units and their relations; creating a query for searching sentences satisfying the query; searching for sentences of the previously analyzed and indexed corpuses satisfying the query; displaying the sentences satisfying the query.