A band control device, a band control method and a band control program for regulating specific application level traffic autonomously so that network resources can be fairly utilized. In the band control device, an application processor checks the contents of application level data to detect regulation subject data. When regulation subject data has been detected, processes such as shutdown, band limitation and delay addition is performed for L3 traffic, an L4 connection and an application level transaction with respect to the regulation subject data. Thus, specific application level traffic is autonomously regulated so that network resources can be fairly utilized.