2. The sign language image input method according to claim 1 , wherein the step “outputting the input sign language image according to a comparison result of the key combination and the code combinations” further comprises: providing a plurality of sign language image candidates according to the comparison result, wherein the sign language image candidates are the sign language images corresponding to the code combination and the similarity between the code combination and the key combination is qualified; and selecting one of the sign language image candidates as the input sign language image.
2. The sign language image input method according to claim 1 , wherein the step “outputting the input sign language image according to a comparison result of the key combination and the code combinations” further comprises: providing a plurality of sign language image candidates according to the comparison result, wherein the sign language image candidates are the sign language images corresponding to the code combination and the similarity between the code combination and the key combination is qualified; and selecting one of the sign language image candidates as the input sign language image. 4. The sign language image input method according to claim 2 , wherein the sign language image candidates are orderly arranged according to the comparison result of the key combination and the code combinations.