An asynchronous transfer mode (ATM) connection band control system, in an ATM network, may include a first memory, a second, different memory, and a connection-setting control portion. The first memory may store, in a buffer control memory, band acquiring data of a connection, the first memory preliminarily acquiring a connection band for the connection, irrespective of the connection being a switched virtual connection (SVC) or a permanent virtual connection (PVC). The second, different memory may store acquired band data of a currently established connection, irrespective of the currently established connection being a PVC or an SVC. The connection-setting control portion may control a setting of the currently established connection, where a band for the currently established connection, irrespective of the currently established connection being a PVC or an SVC, is preliminarily set as the band acquiring data.