PURPOSE: To minimize the input mistakes due to the improvement of the input speed by informing a fact that an input skip unable word is included in each word.

CONSTITUTION: For instance, a declaration means (c) like a line feed key declares totally that the input actions of words are skipped (no input carried out) in a cluding the word which is presently guided for input through a prescribed word in the subsequent input order. Then a detection means (d) checks via a memory means (a) whether or not an input skip unable word which should be inputted is included in a word group where no input is decleared. An information means (e) informs a fact that an input skip unable word is detected by the means (d) and urges the input of the relevant word. Thus it is possible to minimize the input mistakes due to the improvement of the input speed.