Electronic device and application control method thereof

An electronic device comprising:

• a display;
• a wireless communication circuit;
• a volatile memory;
• a processor;
• and
• a non-volatile memory that stores software implementing an operating system (OS) and instructions, which when executed, control the processor to load and execute at least part of the OS on the volatile memory, to load and execute an application, which interfaces with the OS, on the volatile memory, to monitor an operation of the executed application by an operation of part of the OS, and to unload at least part of the application from the volatile memory, when the display is turned off, according to at least part of the monitored result by the operation of part of the OS.