1. An automatic knowledge management system, comprising: a knowledge base management module to accessibly store knowledge information in particular file formats or related file addresses into its knowledge base memory means; an automatic search engine to execute the searching instructions of users to search searchable information in a wide filed knowledge base according to certain search conditions; an information filter module to identify information resulted from the searching of said automatic search engine, to exclude information that does not satisfy a group of filtering conditions and to store information or its addresses that satisfy said group of filtering conditions into said knowledge base memory means; and a searching condition connection module to compare the search conditions as input by one user for one search and/or the corresponding filtering conditions, with the respective groups of search conditions and/or their corresponding filtering conditions previously stored, and to provide to said one user information files and/or addresses of information files resulted from previous searching operations corresponding to such search conditions and/or filtering conditions, when result of such comparison is “relative”.