A mobile device moving in a specific area including a driving unit, an environment sensing unit, a control unit and a transmittal unit is disclosed. The driving unit moves according to a first driving signal. The environment sensing unit detects an outline of the specific area to generate detection information. The control unit processes the detection information to generate first map information and position information. The transmittal unit transmits the first map information to an electronic device. The electronic device generates second map information according to the first map information, and the control unit generates the first driving signal according to the first map information, the second map information and the position information.