An information-processing device includes: multiple keys; a memory that stores key arrangement data indicating an arrangement of said multiple keys; an identification part that identifies each display position of multiple windows displayed on a screen; an allocation part that compares an arrangement of the windows obtained by comparing the display position of each window identified by said identification part with the arrangement of keys displayed by said key arrangement data, and uniquely allocates to said each window a key for selecting the relevant window from among said multiple keys so that the arrangement of said windows and the arrangement of said keys are identical or similar; a notifying part that notifies of the keys allocated by said allocation part; and a selection part that selects the window to which an operated key is allocated when any of the keys notified by said notifying part is operated.