1. A system for generating search queries using visual manipulation of search terms to facilitate a search process over a data network, comprising: a computer connected to said data network; a related terms generator scans over said data network from said computer to obtain at least a list of terms related to an initial search query, wherein the related terms generator further obtains relationships involving said related terms and data entities at different locations in said data network, and organizes said related terms, said relationships, and said data entities in at least one data structure that represents said relationships in said data network, wherein the data structure is organized, based on at least one of data network analysis and expert knowledge, wherein the data entities in said data network are analyzed in accordance with statistical correlations of word frequencies, location, and dates within the data network; a graphical user interface (GUI) at said computer for receiving the initial search query, providing a user with said related terms, wherein said related terms being provided as graphical icons, wherein said GUI further allows visual manipulating of said initial search query by visually placing graphical icons respective of one or more of said related terms to be included in a new refined search query in a plurality of graphical operators controlled by said GUI, each of said plurality of graphical operators applies a different operation on related terms placed therein, wherein said visual manipulation of said initial search query results in a new visual representation of said graphical icons respective of said one or more related terms and interrelationships of said graphical icons with said plurality of graphical operators; and a query generator for generating said new refined search query by applying said plurality of graphical operators on said one or more of related terms, thereby modifying said initial search query according to said visual manipulation.