1. A portable electronic device comprising a display unit capable of scrolling through images on a screen, wherein the portable electronic device uses: a still character font used for at least one character on a still screen; and a plurality of scroll character fonts used for at least one character on a scroll screen, each scroll character font having at least some of the same characters as the still character font, wherein each scroll character font has at least one different visual characteristic when compared to the still character font, wherein one of the plurality of scroll character fonts replaces the still character font for one or more of the at least one character on the scroll screen when scrolling through the images on the screen, the one scroll character font selected to replace the still character font being determined based on a scroll direction of the scrolling such that at least one of a forward side of a plurality of characters of the one scroll character font facing the scroll direction and a rearward side of the plurality of characters facing away from the scroll direction is visually different when compared to corresponding characters of the still character font.