Method and apparatus for saving power of portable electronic device

1. A method of saving power of a portable electronic device, the method comprising:

setting a power saving mode to set a power saving level for at least one application, the power saving level being selected from a group of power saving levels;

starting the power saving mode;

identifying at least one other application being executed in a foreground; and

changing operation settings of the portable electronic device for the other application according to the power saving levels.

2. The method of claim 1 , wherein the starting of the power saving mode comprises:

receiving one of temperature information and battery usage level information of the portable electronic device; and

when a temperature of the portable electronic device is equal to or higher than a predetermined temperature or a usage level of a battery is equal to or higher than a predetermined usage level, starting the power saving mode.

3. The method of claim 1 , wherein the operation setting comprises setting a maximum operation frequency of one of a Central Processing Unit (CPU) and a Graphic Processing Unit (GPU) according to the power saving levels.

4. The method of claim 3 , further comprising selecting the power saving level from the group of power saving levels,

wherein the changing of the operation setting comprises changing the maximum operation frequency of one of the CPU and the GPU according to the power saving level.

5. The method of claim 1 , wherein the operation setting comprises one of a display refresh rate, a brightness, a resolution, and a haptic reaction.

6. The method of claim 5 , further comprising selecting the power saving level from the group of power saving levels,

wherein the changing of the operation settings comprises changing one of the display refresh rate, the brightness, the resolution, and the haptic reaction.

7. The method of claim 1 , further comprising:

displaying a screen for selecting a power saving level from the group of power saving levels; and

selecting the power saving level for the at least one application stored in the portable electronic device.

8. The method of claim 1 , wherein the identifying of the at least one other application executed in the foreground further comprises identifying a battery usage share of the at least one other application.

9. The method of claim 8 , wherein the changing of the operation settings comprises changing an operation of the at least one other application when a battery usage share is equal to or higher than a specific battery usage share.

10. A portable electronic device comprising:

a controller configured to:

set a power saving mode to set a power saving level for at least one application, the power saving level being selected from a group of power saving levels,

start the power saving mode,

identify at least one other application being executed in a foreground, and

change an operation setting of the at least one other application according to the power saving levels.

11. The portable electronic device of claim 10 , further comprising a temperature sensor configured to detect a temperature of the portable electronic device and to detect usage level of a battery,

wherein, when a temperature of the portable electronic device is equal to or higher than a predetermined temperature or a usage level of a battery is equal to or higher than a predetermined usage level, the controller is further configured to start the power saving mode.

12. The portable electronic device of claim 10 , wherein the controller is further configured to set a maximum operation frequency of one of a Central Processing Unit (CPU) and a Graphic Processing Unit (GPU) according to the power saving levels.

13. The portable electronic device of claim 12 , wherein the controller is further configured to:

select the power saving level from the group of power saving levels, and

change the maximum operation frequency of one of the CPU and the GPU according to the power saving level.

14. The portable electronic device of claim 10 , wherein the operation setting comprises one of a display refresh rate, brightness, resolution, and a haptic reaction.

15. The portable electronic device of claim 14 , wherein the controller is further configured to:

select the power saving level from the group of power saving levels, and

change one of the display refresh rate, the brightness, the resolution, and the haptic reaction.

16. The portable electronic device of claim 10 , further comprising a touch screen configured to display an image for selecting the power saving level from the power saving levels,

wherein the controller is further configured to select the power saving level for the at least one application stored in the portable electronic device.

17. The portable electronic device of claim 10 , wherein the controller identifies a battery usage share of the at least one other application.

18. The portable electronic device of claim 17 , wherein the controller is further configured to change an operation of the at least one other application when a battery usage share is equal to or higher than a specific battery usage share.