Patent ID: 8412387

Claim:
A smart device, which is connected to a smart grid network to perform a power saving function, the smart device comprising: a power information receiving unit configured to receive power information through the smart grid network; a power saving control unit configured to perform the power saving function for at least one apparatus based on the power information in a power saving mode, the power saving mode being a mode in which the at least one apparatus is automatically controlled to save power; at least one mode switching unit configured to switch from the power saving mode to a manual mode according to a user command, the manual mode being a mode in which the at least one apparatus is controlled according to a user input; a manual mode operational time determining unit configured to determine a manual mode operational time for operating the at least one apparatus in the manual mode; and a detecting unit configured to receive external environment information, the external environment information including at least one of an external temperature and an external humidity, wherein the at least one mode switching unit is further configured to switch from the manual mode back to the power saving mode, automatically, when the manual mode operational time expires, and wherein the manual mode operational time determining unit determines the manual mode operational time based on the external environment information.