In a conventional word processing apparatus provided with a users' dictionary memory into or from which arbitrary words such as proper nouns can be stored or deleted, each word to be stored or deleted into or from the users' dictionary memory is required to be pointed out by a cursor in the case of the memory mode and to be pointed out by a print head in the case of the typewriter mode. Thus, a word processing apparatus is provided with a storage controlling arrangement for storing the word nearest to a pointer element of an outputting medium, which is a display or a printer, into the users' dictionary memory and a delete controlling arrangement for deleting the word nearest to the pointer element of the outputting medium from the users' dictionary memory.