4. The method of claim 1 , wherein the preference information further comprises information regarding application or non-application of a search preference to the external search result, information regarding application or non-application of prioritized preference to the external search result, and filter information for filtering the external search result.
7. The method of claim 4 , further comprising: filtering the arranged external search result using a prioritized preference; and forwarding the final search result including the filtered external search result to the requesting client.