A method and apparatus for integration of operating systems solve the problem in the conventional techniques with low efficiency in switching among the operating systems. The techniques of the present disclosure firstly starts a first operating system and its agent process, and then starts a second operating system, wherein the second operating system may call the agent process to request the first operating system for resources required by the second operating system. The second operating system may directly request the first operating system for the needed resources, which realizes the coexistence of the first operating system and the second operating system without mutual switching between the operating systems.