An information processing device includes: a receiving unit configured to receive an instruction input by a user; a display control unit configured to control a display unit to display a plurality of windows in a display area of the display unit; and a window control unit configured to control a size or position of a window displayed on the display unit in response to the instruction received, the window control unit being configured to control, if the receiving unit receives an instruction to expand a first window and the expanded first window overlaps a second window, a size or position of the second window in response to a positional relationship between the first window and the second window.