A portable electronic apparatus for receiving and displaying electronic files with identification code is provided. The identification code indicates whether the electronic file is an instant file or a common file. The portable electronic apparatus includes a main part, a data storage, and a receiving unit. The main part being selective in a “power-on” state or a “power-off” state is for displaying the electronic file and obtaining the instant electronic file from the data storage to display when the main part enters into the “power-on” state. The receiving unit is for receiving the electronic file, determining according to the identification code whether the electronic file is an instant file and whether the main part is in the “power-on” state; and storing the electronic file to the data storage and controlling the main part in the “power-on” state if the electronic file is an instant file but the main part is in the “power-off” state.