A communication system offering remote access and a communication method thereof are provided. The communication system includes a remote device, a relay node, and at least one server device. The relay node controls a connection from the remote device to a local area network (LAN). The at least one server device is located in the LAN. The remote device communicates with the relay node by using a web access protocol. The relay node converts a first command compliant with the web access protocol into a second command compliant with a LAN data access protocol, so that the remote device can remotely access the at least one server device through the relay node. Thereby, the remote device can remotely access the at least one server device without setting parameters of related network nodes.