A touch screen display system including at least two touch screen display apparatuses and a host apparatus is provided. The two touch screen display apparatuses respectively include a first touch screen and a second touch screen. One touch screen display apparatus senses the first touch screen in a first time period. Another touch screen display apparatus senses the second touch screen in a second time period. The host apparatus is electrically connected to the two touch screen display apparatuses. The host apparatus determines a touch location of a first touch object on the first touch screen or a touch location of a second touch object on the second touch screen. In addition, a method for controlling a touch screen display system is also provided.