There is provided a method of operating a plurality of storage devices may include providing, by a first storage controller of a first storage device, resources required for execution of an application to a host device so that the host device executes the application; and allocating, by a second storage controller of a second storage device, a storage space to be used by the application executed in a trusted execution environment (TEE) area to the host device in units of applications based on identification information of the host device included in a allocation request.