The present disclosure relates to an input device and a symbol display method thereof. The input device includes at least one button and a display unit. The display unit is arranged in a position adjacent to the button in the input device and includes multiple display regions. The positions of the display regions are corresponding to the positions of the button. The display unit displays multiple display symbols in the display regions. In addition, the display unit is configured to change the display position of at least one display symbol to a different display region according to a personalization signal.