Abstract: A system of analyzing a large document-based propensity over a query language is disclosed. In the system of analyzing the large document-based propensity over the query language, the correlated words and sentences on the query language inputted by the user are searched on the basis of large on-line or off line documents and the general report of analyzing the relationship among the words of the corresponding documents, the propensity of the words and the sentences, the appearance frequency of the recent words and sentences and so on is provided to the user, whereby it can previously predict the propensity (the positive image, the negative image or Non-Applicable), the related word based on the importance and the tendency change through the result of the large document analysis generating for a recent predetermined period according to the query language of the user.