Patent ID: 8180322

Claim:
A wireless terminal device that connects to any wireless master device of a plurality of wireless master devices connected to a data transmitting device and receives data transmitted from the data transmitting device via the wireless master device to which the wireless terminal device is connected, wherein a path between the data transmitting device and a first wireless master device, which is the wireless master device to which the wireless terminal device is connected, includes a section in which QoS secured communication is performable only when a predetermined band required for reception of the data is secured, and wherein the wireless terminal device comprises: a wireless transmitting/receiving unit operable to transmit a signal to and receive the signal from the wireless master device to which the wireless terminal device is connected; a band secure state notification receiving unit operable to receive a band secure request including a band secure state notification from the wireless master device to which the wireless terminal device is connected via the wireless transmitting/receiving unit, the band secure state notification, added to a frame by a relay device operating in the section, being information indicating whether or not the predetermined band is available in the section; and a connection switching unit operable to, when the band secure state notification indicating that the predetermined band is unavailable in the section, switch a connection destination of the wireless terminal device from the first wireless master device to a second wireless master device, which is another wireless master device of the plurality of wireless master devices.