1. A computer-readable storage medium storing a touch input program to be executed by a processor of a touch input device having a first display and a second display arranged on respective left and right sides with respect to a predetermined axis and a touch panel provided on said second display, said touch input program comprising: a setting step, setting a reverse input mode in response to a predetermined operation; a determining step, determining whether or not the reverse input mode is set in said setting step; a first reversing step, reversing first character data vertically and horizontally when result of determination in said determining step is affirmative; a first displaying step of displaying an image based on the first character data reversed in said first reversing step; a first accepting step, accepting through said touch panel a handwriting input operation associated with the image displayed in said first displaying step; and a second displaying step, displaying on said second display an image based on handwriting input data corresponding to the handwriting input operation accepted in said first accepting step.