An information input method using a wearable information input device is provided. The information input method using a wearable information input device, which is worn on predetermined body parts of a user and has sensors for sensing motions of the predetermined body parts on a plane or in a space, includes selecting a key group including a desired key corresponding to information that the user desires to input by moving a first predetermined body part, and selecting the desired key from the selected key group by moving a second predetermined body part. Accordingly, the user can easily and quickly select a key on an information screen externally, and areas overlapped by the information screen in a monitor can be minimized.