An actively restorable gear shifting device and a gear shifting method using the same are provided. The gear shifting device includes a gear shifting lever unit that is moved from an initial position to an operating position by external operating force and is connected to a restoring mechanism to be restored to the initial position when the operating force is eliminated. A driving gear is connected to the gear shifting lever unit to be rotated by a motion of the gear shifting lever unit. A driven gear engages with an outer tooth portion of the driving gear, connects to a gear shifting cable, and implements gear shifting by pushing or pulling the gear shifting cable by a rotation of the driving gear. The gear shifting lever unit is connected to the driving gear by a pawl, and the pawl has a first joining position and a second joining position.