NETWORK CONNECTION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a network connection device which can construct a simple and flexible network system and also can easily be utilized. SOLUTION: This network connection device is provided with 1st interface parts 5 composed of at least one type of physical layers for being connected to an external network, 2nd interface parts 6 composed of a plurality of types of physical layers for being connected to an internal network and a controlling part 2 controlling the 1st and 2nd interface parts 5 and 6, and the part 2 transmits and receives information between the 1st interface parts 5 and the 2nd interface parts 6 or through between the 2nd interface parts 6.