Mobile game has undergone a change from downloadable game to network game, where a large number of users connect to server and play real-time game with a mobile phone. In order to develop these mobile network games economically, suitable game engine is needed. This study proposes the result of design of MNGE(Mobile Network Game Engine) that is used to develop a mobile network game. The structure of MNGE, which is the research result of this study, consists of major components such as Network/Client Module, Object Module, Map Tool, Script Editor, and Character Editor.