Utilized-network selection method, communication system and mobile terminal

摘要

A mobile information terminal communicates with a terminal of another party by utilizing a prescribed network from among a plurality of networks. During communication with the other party by utilizing a first network, another network or deterioration of reception conditions is detected. When another network or deterioration of reception conditions is detected, a server system automatically selects a network for continuing communication (i.e., an ASP makes the selection automatically) or presents recommended networks on a display unit of the mobile information terminal so that the network for continuing communication may be selected on the side of the mobile information terminal and reported to the server system (i.e., the user makes the selection). Communication is continued via the selected network under the control of the server system.