4. The method of claim 1, comprising sensing the plurality of actuations of the keys which correspond to the break-down in which strokes are characterized as having five basic types: horizontal, vertical, left-falling, right-falling, and turning, each of the five basic types encompassing at least two strokes, the five basic types being allotted numerical codes 1, 2, 3, 4, and 5 according to frequencies of the five basic types in practical Chinese usage.
4. The method of claim 1, comprising sensing the plurality of actuations of the keys which correspond to the break-down in which strokes are characterized as having five basic types: horizontal, vertical, left-falling, right-falling, and turning, each of the five basic types encompassing at least two strokes, the five basic types being allotted numerical codes 1, 2, 3, 4, and 5 according to frequencies of the five basic types in practical Chinese usage. 5. The method of claim 4, comprising sensing the plurality of actuations of the keys which correspond to the break-down in which roots are classified into five sections, the five sections being allotted numerical codes 1, 2, 3, 4, and 5.