Communication system and method

A communication system, comprising:

• a first electrical device, having an end point which is configured to simultaneously connect a plurality of 3G dongles to obtain multiple network frequency bands to transmit data packets in multiple network frequencies, wherein each of the 3G dongles has a different IP address;
• a cloud server, integrating the different IP addresses to generate an integrated IP address, when the cloud server detects the first electrical device is connected to the plurality of 3G dongles;
• a second electrical device, transmitting the data packets with the first electrical device by the integrated IP address through the cloud server;
• and
• a management module, setting up an agent module in the cloud server when the cloud server detects that the first electrical device is connected to the plurality of 3G dongles,
• wherein the data packets may be added a header at the end point, the data packets with the header are encoded into an application data packet and the application data packet is transmitted to the agent module, wherein the header comprises synchronization information and switching information.