An electronic device is configured to support a multitasking environment, the electronic device comprises a communication circuit configured to communicate with at least one external device; a microphone configured to receive voice input; a memory storing a plurality of application programs; a display configured to output a plurality of virtual windows as the plurality of application programs are executed and at least one processor electrically connected with the communication circuit, the microphone, the memory, and the display, wherein the processor is configured to execute the plurality of application programs, determine whether at least one condition is satisfied for controlling a background state of a first window, when a first voice input is generated for controlling a function of a first application program in the first window that is in the background state, and maintain the first window in the background state and a second window, which is associated with a second application program, to be in a foreground state, while processing the first user input, when the at least one condition is satisfied.