A word processor including a screen display unit for displaying characters, etc. on a screen, a key input unit for inputting the characters, etc., a print unit for printing document data of documents, a document producing unit for producing the documents from data inputted from the key input unit, and a document control unit for inputting document control data to a recording medium or outputting data stored in the recording medium to the screen display unit. The key input unit includes a command device for giving a command relevant to automatic production of a title of an untitled document, and the document control means includes a title producing device for automatically producing the title of the untitled document in response to the command from the command device.