The present invention relates to a more particularly, techniques for data transmission rule for the device and the network devices share to distribute the data traffic to a device for balancing the data traffic between different wireless networks. The invention unit in the terminal can transmit data to a plurality of wireless networks, transmission rule for sending the transmission rule decision unit, the determined data transmission rule for determining a data transmission rule for each of the plurality of network to a network device transmitting, based on the plurality of network connections, the determined data transfer rules corresponding to each of the plurality of wireless network and includes a transmission network selection for selecting a data transfer network connecting portion for transmitting the data, and the data is the data transmission network connecting portion to provide a corresponding device which is characterized in that transmission to the wireless network. According to the invention there is a terminal which can be connected in a heterogeneous wireless network, the data transmission rule and terminal network devices for transmitting and distributing data to a heterogeneous wireless network may be shared. Data transfer rules, heterogeneous network traffic, distributed transmission