Head-mounted electronic device for converting a screen of an electronic device into extended reality and electronic device connected thereto

An electronic device comprising:

• memory having computer readable instructions;
• and
• at least one processor for executing the computer readable instructions, the computer readable instructions, when executed by the at least one processor individually or collectively, cause the electronic device to:
• display, on a display, objects related to an execution screen of an application being executed, the objects being configured to display pieces of content related to the application;
• convert, by the electronic device, the objects into virtual objects to be displayed in a visual image output on a head-mounted electronic device;
• in response to converting the objects into the virtual objects by the electronic device, transmit the visual image of the virtual objects to the head-mounted electronic device for output by the bead-mounted electronic device;
• in response to transmitting the visual image of the virtual objects to the head-mounted electronic device, verify a first information of a theme corresponding to a color of the execution screen of the application displayed on the display and a second information of the visual image having been transmitted for output by the head-mounted electronic device;
• and
• control at least one of a brightness and a saturation of the virtual objects in the visual image output on the head-mounted electronic device based on at least one of the first information of the theme and the second information of the visual image.