Data display method and data display system

The invention discloses a data display method and a data display system. According to the method, a first terminal responds to selection operation of an extended screen mode on a first display screen, a host module identifies a started application, when the application is a pre-adaptive application, a first control chip controls and keeps displaying a first display picture before the application is started on the first display screen, and when the application is not the pre-adaptive application, a second control chip controls and keeps displaying a second display picture before the application is started. The host module transmits the applied second picture data to the second control chip, and the second control chip controls the second display screen to display the second picture data; and when the application is not the pre-adaptive application, the host module transmits second picture data of the application to the first control chip, and the first control chip controls the first display screen to display