A portable electronic apparatus includes an operating system comprising an application layer, an application framework layer, a libraries layer and a kernel layer. The application layer includes a cloud user interface allowing a user to perform an interactive function. The application framework layer includes a plurality of cloud components and at least a cloud service. The libraries layer includes a plurality of cloud managers. The kernel layer includes a cloud server driver, which is connected to the cloud managers to start the cloud service, so that the cloud service calls one of the cloud components according to the interactive function. By such configuration, the portable electronic apparatus of this invention can carry a private cloud to provide the service of a portable personal cloud.