A mobile terminal that ensures smooth, continuous communications sessions even when in transit, regardless of base station capabilities and functionalities, in a packet-switched data communications network. With this terminal, each of a plurality of lower interfaces 101-1 to 101-M, when its associated access mechanism is in an active state, can obtain a connection to packet-switched data communications network 150 using its home-address HoA.1 or its care-of-address CoA.BS1. When lower interface 101-a loses its connection obtained using the care-of-address CoA.BS1, multiple access decision unit 104 instructs mobility support unit 102 to set up a binding of the home-address HoA.1 and either one of the home-address HoA.2 and the care-of-address CoA.BS2 of another lower interface 101-b. Mobility support unit 102 sets up the binding according to the instruction from multiple access decision unit 104.