Touch screen region selecting method

A region selecting method for a touch screen implemented by a central processing unit (CPU), the method comprising:

• providing the touch screen that senses and recognizes tracks of two line-drawing operations simultaneously imposed thereon;
• receiving the two line-drawing touches and displaying two lines according to the tracks of the received two line-drawing touches on the touch screen via the CPU;
• identifying start points and terminal points of the two lines via the CPU;
• connecting the start point and the terminal point of each line to generate a first line and a second line respectively via the CPU;
• connecting the start points of the two lines to generate a third line via the CPU, and connecting the terminal points of the two lines to generate a fourth line via the CPU;
• identifying a region framed by the first line, the second line, the third line, and the fourth line, obtaining displayed contents in the framed region, and performing an operation for the displayed contents in the framed region according to a user input via the CPU.