A power control method used with a TV module of a portable electronic apparatus is used for selectively entering the TV module in a power-saving mode. At first, the portable electronic apparatus is activated. When the portable electronic apparatus is activated, the power supply condition of the portable electronic apparatus is detected. If the power supply condition of the portable electronic apparatus indicates that an external power source is used, the power-saving mode of the TV module is suspended. Optionally, the power-saving mode of the TV module is suspended if a priority setting condition indicates that play efficiency takes priority.