1. A handwriting processing apparatus comprising: an input unit configured to input a handwritten character; a dictionary which stores a shape of each of a plurality of characters; a recognition unit configured to recognize a corresponding character in said dictionary with respect to the handwritten character input to said input unit and determine a similarity between the handwritten character and the corresponding character by comparing the handwritten character with the shape of each of the characters stored in said dictionary; an assignment unit configured to assign a recognition disable code to the handwritten character as a character code if the similarity is less than a predetermined reference value and assign a text code of the corresponding character to the handwritten character as a character code if the similarity is not less than the reference value; and a storage unit configured to store the assigned character code, with handwriting trail data of the handwritten character corresponding to the recognition disable code if the assigned character code includes the recognition disable code.