Provided is a control system applied to a screen projection scenario. The system includes: a mobile phone and a display device, receiving first screen content and a target navigation function identifier sent by the mobile phone; generating, according to the target navigation function identifier, a collaboration window including a screen projection area and a navigation bar, where the navigation bar includes three virtual navigation keys; displaying the first screen content in the screen projection area; receiving a keyboard and mouse operation acting on the virtual navigation keys; generating a key instruction according to the keyboard and mouse operation, and sending the key instruction to the mobile phone, so that the mobile phone executes a navigation function according to the key instruction, and the mobile phone can adjust the first screen content to second screen content; and displaying, by the display device, the second screen content in the screen projection area.