Device and method of running multiple operating systems and presenting multiple operation screens

A method of executing a plurality of operating systems in a device configured to execute the plurality of operating systems, the method comprising:

• controlling a display to display an operation screen of a first operating system when the first operating system is activated;
• based on receiving a first user input tracing an outline on the display, controlling to activate a second operating system;
• controlling the display to display the operation screen of the first operating system on a first display region of the display and to display the operation screen of the second operating system on a second display region of the display, the second display region being defined by a size of the outline and a location of the outline;
• and
• based on receiving a second user input, controlling the display to change at least one of a size of the second display region and a location of the second display region,
• wherein a signal designating user input received on the first display region and a signal designating user input received on the second display region, are filtered from the first operating system.

A non-transitory computer-readable recording medium having embodied thereon a computer program for executing a method comprising:

• controlling a display to display an operation screen of a first operating system when the first operating system is activated;
• based on receiving a first user input tracing an outline on the display, controlling to activate a second operating system;
• controlling the display to display the operation screen of the first operating system on a first display region of the display and to display the operation screen of the second operating system on a second display region of the display, the second display region being defined by a size of the outline and a location of the outline;
• and
• based on receiving a second user input, controlling the display to change at least one of a size of the second display region and a location of the second display region,
• wherein a signal designating user input received on the first display region and a signal designating user input received on the second display region, are filtered from the first operating system.