12. The apparatus of claim 11 , wherein the first keyword information is selected by the first user directly from the first document data that is displayed when the search task is performed.
12. The apparatus of claim 11 , wherein the first keyword information is selected by the first user directly from the first document data that is displayed when the search task is performed. 19. The apparatus of claim 12 , wherein the search assistant is further configured to obtain user identification information identifying the first user, wherein the plurality of data elements of the context information further includes the user identification information; and the context manager is configured to organize the plurality of data elements by the user identification information and to generate personalized metadata resource specific to the first user, and to generate the document list using the personalized metadata resource specific to the first user when the second user is identified as the first user.