Screen controlling method and electronic device thereof

An electronic device comprising:

• a display;
• and
• at least one processor operatively connected with the display;
• wherein the at least one processor is configured to:
• control the display to display, by execution of a first application, first data within a first region, the first data being image data, and the first data displayed with a designated aspect ratio;
• in response to detecting an event, control the display to display an icon superimposed on the displayed first data, the icon being usable for executing a second application distinct from the first application;
• and
• in response to detecting a user input on the icon, control the display to display,
• within a second region smaller than the first region, the first data with the designated aspect ratio, and
• displaying, by execution of the second application, second data within a third region distinct from the second region, and the second region and the third region included in the first region.