An electronic device is electrically connected to an external electronic device. The electronic device includes an assignment component, a memory component and a control component. The assignment component is configured to assign control codes that control operations of the external electronic device to a plurality of control keys of a remote control to generate assignment information indicating corresponding relationship between the control codes and the control keys of the remote control. The memory component is configured to store the assignment information generated by the assignment component. The control component is configured to control the external electronic device based on the assignment information stored in the memory component when the control component receives an operation signal indicating that one of the control keys of the remote control is operated.