A foldable device includes: a flexible display configured to display an execution screen of an application; and a controller configured to control the flexible display to display an execution screen of at least one first application on a first surface of the flexible display that is used as a display of the foldable device when the flexible display is folded, and control, in response to the flexible display being unfolded, the flexible display to display the execution screen of the at least one first application and an execution screen of at least one second application related to the at least one first application to be displayed on a second surface of the flexible display that is used as a display of the foldable device when the flexible display is unfolded.