The information-processing device according to the present invention, if a subject operation direction is “rightward,” specifies in a coordinate axis across a rightward direction, a range that overlaps an area between coordinates (Yamin to Yamax) of an area where selected window Wa is displayed, and each of areas between coordinates (Y1min to Y1max and Y2min to Y2max) of areas where non-selected windows Wb1 and Wb2 are displayed, and determines a window that is selectable subsequently on the basis of the overlapping range. The information-processing device displays a guide image at a position between a window that is selectable subsequently and selected window Wa, and is also within a range that overlaps both an area where a window that is selectable subsequently is displayed, and an area where window Wa is displayed, to guide a subject operation direction.