11. A typewriter having means for preparing, based on a text, a plurality of documents with alterations of phrases from one document to another in at least one phrase-inserting part of the text, which comprises: a memory device including a text memory storing at least one text data representing said text, a phrase memory storing plural sets of phrase data which represent plural different phrases to be inserted into the respective documents and which are designated by respective phrase-indicating codes, and a work memory storing at least one set of work data comprising selected plural ones of said phrase-indicating codes in a manner as to specify the order in which said phrase-indicating codes are read out, said at least one set of work data being designated by a working-group code, said text data including said working-group code at a position corresponding to said at least one part of said text; a control device for reading out said text data from said text memory plural times corresponding to the number of the documents to be prepared, while upon reading of said working-group code, reading out from said phrase memory said plural sets of phrase data as said plural sets of phrase data are designated in said order by said phrase-indicating codes of said work data which is designated by said working-group code; a keyboard through which said text, phrase and work data are keyed into said text, phrase and work memories, respectively, and through which said phrase-indicating codes and said working-group code are registered; a printer for printing said text in combination with said plural different phrases designated by the sequentially read-out sets of said phrase data to insert said plural different phrases into said one phrase-inserting part of the text of the respective documents; and a display for displaying said text, phrase and work data.
12. A typewriter as recited in claim 11, wherein said display indicates alternately at predetermined intervals said phrase-indicating code, and a predetermined number of leading characters of said phrase data designated by the phrase-indicating code, when the phrase-indicating code is entered through said keyboard after said phrase data has been stored in said phrase memory.