Method and apparatus for reducing power consumption based on use pattern of user

A device comprising:

• a touch screen;
• and
• at least one processor configured to at least:
• when a user input is not received for a preset time period via the touch screen, turn off the touch screen and determine that an out-focus status in which the user does not use the device has started,
• based on both the out-focus status being started and a current context of the device, identify a probability of the out-focus status being maintained,
• based on the identified probability of the out-focus status being maintained, calculate an expected period in which the out-focus status is to be maintained from when the out-focus status has started, and
• based on both the out-focus status being started and the expected period being equal to or greater than a reference time period, stop an operation of an application which is being executed in a background on the device.