6. Document processing apparatus comprising: key input means for entering characters and instructions to said apparatus, the characters comprising words and the words comprising title information and a plurality of documents; means for coding each of the characters entered by said key input means and for coding each word entered by said key input means as a number of digits; memory means for storing a plurality of words in a random order, each word being comprised of at least one character and having a word code determined by the coding by said coding means of the at least one character of which each word is comprised, said memory means storing the title information input by said key input means, the title information corresponding to each document input by said key input means, said memory means having a field for numbering, an evaluation value obtained by comparing each of titles of the stored title information being stored in the field, and a currently displayed title information being changed to a title to be displayed with other titles in a reverse sequence or a forward sequence in accordance with the stored evaluation value; means responsive to entry of an instruction by said key input means for reading out the stored words from said memory means in a read out order determined on the basis of the word code; means for comparing each digit position of the numerals comprising the word codes to determine which is larger and for generating the evaluation value based on the comparison; means for determining the read out order of the stored words on the basis of the evaluation value which is determined by the comparison of respective digit positions in each of said words; and means for displaying the words read out from said memory means by said reading out means in said read out order, said displaying means having a display capacity for displaying words less than the capacity of said memory means for storing words, said key input means entering an instruction for specifying one of a forward sequence and a reverse sequence for the order of display of the words.
6. Document processing apparatus comprising: key input means for entering characters and instructions to said apparatus, the characters comprising words and the words comprising title information and a plurality of documents; means for coding each of the characters entered by said key input means and for coding each word entered by said key input means as a number of digits; memory means for storing a plurality of words in a random order, each word being comprised of at least one character and having a word code determined by the coding by said coding means of the at least one character of which each word is comprised, said memory means storing the title information input by said key input means, the title information corresponding to each document input by said key input means, said memory means having a field for numbering, an evaluation value obtained by comparing each of titles of the stored title information being stored in the field, and a currently displayed title information being changed to a title to be displayed with other titles in a reverse sequence or a forward sequence in accordance with the stored evaluation value; means responsive to entry of an instruction by said key input means for reading out the stored words from said memory means in a read out order determined on the basis of the word code; means for comparing each digit position of the numerals comprising the word codes to determine which is larger and for generating the evaluation value based on the comparison; means for determining the read out order of the stored words on the basis of the evaluation value which is determined by the comparison of respective digit positions in each of said words; and means for displaying the words read out from said memory means by said reading out means in said read out order, said displaying means having a display capacity for displaying words less than the capacity of said memory means for storing words, said key input means entering an instruction for specifying one of a forward sequence and a reverse sequence for the order of display of the words. 8. A document processing apparatus according to claim 6, wherein said apparatus further includes a buffer for temporarily storing the words read out by said reading out means.