Collaboration between mobile devices is again attracting attention because mobile devices are getting more powerful and more widespread. In addition, cloud computing technology is being applied to mobile devices. A variety of tasks is made possible despite the technical limitations. Also, the cloud can be treated as a virtual space between devices. So, each of the mobile devices can share their own superfluous resources in the cloud. It is expected to be a good solution for preventing the waste of IT resources and increasing working efficiency. So, in this journal, models of collaboration with mobile cloud are proposed to equip environment with cooperative work and group service.