19. Document processing apparatus, comprising: means for inputting data representing documents and titles respectively associated with the documents by a plurality of key input operations and indicating a registration of the input documents and titles; means, in response to the registration indication by said inputting means, for storing in a random order characters comprising documents and titles input by said inputting means, said storing means having a field for numbering, an evaluation value obtained by comparing each of the titles being stored in the field and a currently displayed title being changed to a title to be displayed with other titles in a reverse sequence or in a forward sequence in accordance with the stored value; means for displaying a portion of the titles stored in said storing means; means for generating first and second display control signals; means for assigning the titles stored in said storing means an order by comparing each of the titles and generating the evaluation value for each of the titles, the order of the titles being indicated by the generated evaluation values; and control means responsive to said first display control signal for controlling said display means to display a first title stored in said storing means, the first title being first with respect to the other titles stored in said storing means in the order assigned thereto by said assigning means until successive second display control signals are generated and then responsive to said second display control signals for controlling said display means to sequentially display each of the titles stored in said storing means in the assigned order following the first displayed title.
25. Document processing apparatus according to claim 19, wherein said control means sequentially updates a part of the displayed titles in response to the second display control signals.