1. A handwritten character input assistant apparatus, comprising in a handwritten character input apparatus having no input frame for each character: a handwritten character pattern end coordinate detecting part for detecting a coordinate of a rightmost end of an input handwritten character pattern in a case of a horizontal line orientation and a coordinate of a lowermost end of the handwritten character pattern in a vertical line orientation; a blank guide display coordinate calculating part for adding a predetermined interval value to the coordinate to calculate a coordinate of a position for displaying a blank guide; a blank guide display part for displaying the blank guide in the same display area as that of the handwritten character pattern; and a blank character recognizing part for, in a case where a new handwritten character pattern is input in a blank area present on a side of the handwritten character pattern from the blank guide, recognizing that a blank character is not present in the blank area present on the side of the handwritten character pattern from the blank guide, and in a case where the new handwritten character pattern is input on a right side or a lower side from the blank guide, recognizing that a blank character is input in the blank area present on the side of the handwritten character pattern from the blank guide.