A method for inputting Chinese characters, English alphabets, and Korean characters by using a numerical keyboard. The numerical keyboard includes a switching key set for switching the numerical keyboard to a respective software for presenting the Chinese characters, English alphabets and Korean characters. The Chinese characters, English alphabets, and Korean characters are distributed in the keys of the numerical keyboard. The Chinese character is inputted by clicking keys representing first stroke of a traditional recognized component of a Chinese character to be inputted and, a first and a last strokes of a non-traditional recognized component. The English alphabet and the Korean characters are inputted by keys representing vowels, consonants and epilogs thereof and if necessary, other keys for identifying the Chinese characters having same input way are inputted, and the # key and *key are used as auxiliary keys.
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