An information processing device includes: a foldable one display; a memory which stores at least a program; and a processor which executes the program stored in the memory. By executing the program stored in the memory, the processor performs: display mode switching processing to switch between a first display mode in which display of a screen area of the display is controlled as one display area, and a second display mode in which the screen area of the display is split into two display areas of a first display area and a second display area to control the display; information holding processing to hold window information about position and size, in the screen area, of a window of each application running in the first display mode; and display control processing to display the window of the running application in the screen area.