Provided is a method for distributing a user interface (UI) for heterogeneous multi-device interaction, and more particularly, a method of distributing a UI between heterogeneous platforms, the method supporting distribution of UI units so that a flexible multi-device use environment, such as a live streaming application, is possible even between heterogeneous platforms. A provided mobile operating system security technology allows a flexible multi-device use environment, such as a live streaming application, between heterogeneous platforms by supporting the distribution of UI units and ensures secure multi-surface sharing by considering and preventing security risk elements in a multi-device environment.