DIGITAL PROCESSING UNIT HAVING KEY INPUT UNIT AND KEY INPUT METHOD

PURPOSE: A digital processing device and a key input method equipped with the key input unit consisting of a minimum key button are provided to minimize the number of key buttons by maximizing the number of information capable of inputting the key button. CONSTITUTION: A base(210) is fixed to a center position of a key button unit. A slider(230) parallel moves with the user operation in the horizontal plane of a base. A frame supports the translating of the slider. The restoration processor offers the resistivity toward the translating of slider. The slider which is parallel moved is returned to the original position. The frame is arranged between the base and the slider. The base and the slider perpendicularly touch according to the oblique side of the frame.