A multi-window management apparatus includes: an activating icon display unit for displaying activating icons 60, 62, 64 and 66 on a display screen 56; a window display unit opening, when activating icon 64 is designated, a window 72 corresponding to activating icon 64 next to activating icon 64; and a window arranging unit for rearranging and displaying, when activating icon 64 is designated, a window 68 that has been open, and activating icons 60, 62 and 66 other than the designated activating icon 64, such that these are arranged along the longer side direction of display screen 56 not to be overlapping on an area where the new window 72 is to be opened.