Touch screen device and method for operating touch screen device

A method for operating a touch screen device and a touch screen device. The method comprises: a touch screen device receives a user command, and identifies the user command (100); when the touch screen device identifies the user command as a mode switching command, operation mode switching is performed (200), an operation mode being a left hand operation mode, a right hand operation mode or a normal mode. Via a pre-defined or user-defined operation command, operation mode switching of a touch screen device may be achieved by a single hand, solving a key problem of single-handed operation of a touch screen device having a large screen. Single-handed operation is truly achieved, thereby improving the user experience of a touch screen device having a large screen.