Uninterruptible power supply system and power management method thereof suitable for audio visual apparatus

An uninterruptible power supply system (UPS) (110) and a power management method thereof suitable for an audio visual apparatus (130) are provided. The uninterruptible power supply system (110) includes a power management unit (120), a wireless transceiver module (114) and a current detecting unit (112), wherein the current detecting unit (112) is coupled to an output of the power management unit (120) to detect a load current output from the UPS system (110). The UPS (110) is capable of receiving and learning a wireless command code in an infrared ray (IR) remote control signal. When the UPS system (110) detects a multimedia system connected thereto is turned on and the UPS system (110) is in a lower power state, the UPS system (110) sends command code to turn off the multimedia system to avoid the damage of the multimedia system during power failure.