15. The portable electronic device according to claim 14 , wherein, when a character of the first scroll character font is compared with a corresponding character of the still character font, a color of at least a forward edge and a rearward edge with respect to the first scroll direction is different, and wherein, when a character of the second scroll character font is compared with a corresponding character of the still character font, a color of a forward edge and a rearward edge with respect to the second scroll direction is different.
16. The portable electronic device according to claim 15 , wherein the color tone of a character of the first scroll character font on the forward edge in the first scroll direction is identical to the color tone of a character of the second scroll character font on the forward edge in the second scroll direction.