Character input device and character input method

A character input device comprising:

• a touch screen;
• a word dictionary database;
• a first keypad information database for storing information on a first keypad;
• a second keypad information database for storing information on a second keypad;
• a first keypad creation unit for displaying, in a character input mode, the first keypad configured of at least one or more character keys on the touch screen;
• a first key touch recognition unit for acquiring, when touch of a first key is sensed from the first keypad, a character code corresponding to a value of the first key from the first keypad information database and invoking a second keypad creation unit;
• the second keypad creation unit for creating and virtually displaying the second keypad on the first keypad according to the invocation of the first key touch recognition unit;
• a second keypad touch recognition unit for acquiring, when a touch movement action is sensed from the second keypad, at least one character code corresponding to the touch movement action from the second keypad information database;
• an input character string creation unit for creating at least one or more input character strings by combining the character code of the first key with the character codes acquired by the second keypad touch recognition unit;
• and
• a word recognition processing unit for extracting and displaying character strings of a completed word by performing character string pattern matching between the created input character strings and words stored in the word dictionary database.