An information-processing device stores information as assignment information to assign associated hardware or software to each window that displays processing details of an application. An association between a window and hardware or software is different for each application (in other words, for each window). If plural overlapping windows are displayed, the information-processing device determines a window to be displayed in the foreground, on a basis of the association. For example, in a case where window w1 of a game and window w2 of another game overlap each other, if the information-processing device has hardware or software associated with game A, window w1 is displayed at the front; and meanwhile if the device has hardware or software associated with game B, window w2 is displayed at the front.