Abstract: The present disclosure discloses a terminal device and word stock update method thereof. In the terminal device, an acquisition module acquires a keyword related to the current region of the terminal device; an update module adds the keyword to a first personal word stock; and an output module searches the first personal word stock for a word corresponding to a currently-input index and outputting the found word. By using the terminal device and the word stock update method thereof, a keyword of the current region of the terminal device can be added to a personal word stock of the terminal device, so that a user can input a word related to the current region quickly to improve input efficiency.