Methods and devices for remote hosting of applications across operating system are disclosed. In particular, a second application may be launched and run remotely on a remote server running a first operating system, and the screen images of the second application may be rendered in a first application on a terminal device running a second operating system. In one implementation, a launching instruction may be sent by the terminal device through the first application to the remote server. The second application may then be launched in the remote server. Rendering parameters comprising API functions and API parameters may then be obtained in real-time during the running process of the second application. A rendering instruction containing the rendering parameters may then be sent to the first application in the terminal device for instructing the first application to render the screen images on the terminal device.