A wearable device (101;201) comprising: a touch screen; and a processor configured to: display an execution screen of a first application on the touch screen; receive a first input for simultaneously executing the first application and a second application related to the first application; and display a first execution screen corresponding to the execution screen in a first part of the touch screen and a second execution screen among a plurality of execution screens corresponding to the second application in a second part of the touch screen, different from the first part of the touch screen, in response to the first input, wherein the second part of the touch screen surrounds the first part of the touch screen; and characterized in that the processor is further configured to: determine the second application based on a selection from among a plurality of applications stored in the wearable device (101;201) on the basis of at least one of a type, a number of executions, and an execution time of an application executed after the first application ends, and when a long press input on the second execution screen is received, display a third execution screen, replacing with the first execution screen, of the second application in the first part of the touch screen and a fourth execution screen, replacing with second execution screen, of a third application related to the second application in the second part of the touch screen. a touch screen; and a processor configured to: display an execution screen of a first application on the touch screen; receive a first input for simultaneously executing the first application and a second application related to the first application; and display a first execution screen corresponding to the execution screen in a first part of the touch screen and a second execution screen among a plurality of execution screens corresponding to the second application in a second part of the touch screen, different from the first part of the touch screen, in response to the first input, wherein the second part of the touch screen surrounds the first part of the touch screen; and characterized in that the processor is further configured to: determine the second application based on a selection from among a plurality of applications stored in the wearable device (101;201) on the basis of at least one of a type, a number of executions, and an execution time of an application executed after the first application ends, and when a long press input on the second execution screen is received, display a third execution screen, replacing with the first execution screen, of the second application in the first part of the touch screen and a fourth execution screen, replacing with second execution screen, of a third application related to the second application in the second part of the touch screen. display an execution screen of a first application on the touch screen; receive a first input for simultaneously executing the first application and a second application related to the first application; and display a first execution screen corresponding to the execution screen in a first part of the touch screen and a second execution screen among a plurality of execution screens corresponding to the second application in a second part of the touch screen, different from the first part of the touch screen, in response to the first input, wherein the second part of the touch screen surrounds the first part of the touch screen; and characterized in that the processor is further configured to: determine the second application based on a selection from among a plurality of applications stored in the wearable device (101;201) on the basis of at least one of a type, a number of executions, and an execution time of an application executed after the first application ends, and when a long press input on the second execution screen is received, display a third execution screen, replacing with the first execution screen, of the second application in the first part of the touch screen and a fourth execution screen, replacing with second execution screen, of a third application related to the second application in the second part of the touch screen. determine the second application based on a selection from among a plurality of applications stored in the wearable device (101;201) on the basis of at least one of a type, a number of executions, and an execution time of an application executed after the first application ends, and when a long press input on the second execution screen is received, display a third execution screen, replacing with the first execution screen, of the second application in the first part of the touch screen and a fourth execution screen, replacing with second execution screen, of a third application related to the second application in the second part of the touch screen.