Communication device and communicating method

A communication device capable of automatically selecting directly communication with an external device using a first communication technology with a first predetermined bandwidth or indirectly communication with the external device via an electronic device;

• the communication device comprising:
• a determining module configured to determine whether the communication device establishes a communication with an electronic device capable of using a second communication technology with a second predetermined bandwidth and generate a detecting signal when the communication device establishes a communication with the electronic device;
• a detecting module configured to detect a remained bandwidth of the second communication technology in response to the detecting signal;
• a comparing module configured to determine whether the first predetermined bandwidth is less than the remained bandwidth;
• and
• a control module configured to control the communication device to communicate with the external device via the electronic device using the second communication technology when the first predetermined bandwidth is less than the remained bandwidth.