Abstract: A communication apparatus which is connected to networks including first network of first security level which is lowest security level and second network of second security level, and is wirelessly connected to terminal receiving terminal identifier and password which designates one of networks, from terminal, selecting one of first security level and second security level based on an authentication result of terminal, terminal identifier, and password, forwarding, when second security level is selected, data item which is transmitted from terminal and is encrypted using cryptographic algorithm and cryptographic key to second network, and forwarding, to terminal, data item which is transmitted from second network and addressed to terminal, and forwarding, when first security level is selected, data item transmitted from terminal to first network, and forwarding, to terminal, data item which is transmitted from first network and addressed to terminal.

Abstract: A wireless LAN communication system is composed of: a wireless LAN network including an AP 4 as one of the network apparatuses and a terminal 5 as one of the wireless terminals; and a wired network such as a LAN 1 to which the AP4, an authentication server 2, and other apparatus (such as a DHCP server 3) are connected.

Abstract: An access point apparatus includes a first communication unit sending a radio terminal a beacon representing the availability of an access point apparatus, and receiving a connection request signal from the radio terminal in response to the beacon; a second communication unit communicating with a control unit which controls a load state of the access point apparatus via the first communication unit; a memory storing connection control information received from the control unit via the second communication unit, the connection control information depending upon the load state of the access point apparatus; and a connection control unit controlling the operation of the first communication unit on the basis of the connection control information.

Abstract: A communication apparatus which is connected to networks including first network of first security level which is lowest security level and second network of second security level, and is wirelessly connected to terminal receiving terminal identifier and password which designates one of networks, from terminal, selecting one of first security level and second security level based on an authentication result of terminal, terminal identifier, and password, forwarding, when second security level is selected, data item which is transmitted from terminal and is encrypted using cryptographic algorithm and cryptographic key to second network, and forwarding, to terminal, data item which is transmitted from second network and addressed to terminal, and forwarding, when first security level is selected, data item transmitted from terminal to first network, and forwarding, to terminal, data item which is transmitted from first network and addressed to terminal.