1. A display apparatus, comprising: a display control unit configured to generate one or more instructions to display predetermined information on a display screen; a position detecting unit configured to identify first and second touch positions associated with contact between a surface of the display screen and corresponding ones of a first touch substance and a second touch substance, the first touch substance contacting the surface of the display screen at the first touch position simultaneously with the second touch substance contacting the surface of the display screen at the second touch position; and a display splitting unit configured to, upon detection of the first and second touch positions, generate an instruction to split the display screen into at least two display areas according to a relative movement between the first and second touch positions when the first touch substance is detected to be moved in relation to the second touch substance while both the first touch substance and the second touch substance maintain contact with the surface of the display screen, wherein the two display areas are separated by a corresponding border line, the border line being substantially perpendicular to at least one of (i) a line connecting the first and second touch positions, and (ii) a direction of the movement.