Data communication system, data communication device, program product for controlling data communication device, and portable terminal

摘要

A data communication device includes the first interface for communicating with a portable terminal and the second interface for communicating with another communication device. The data communication device makes a judgment as to whether the first connection format for communication with the portable terminal via the first interface should be allowed when the data communication device receives the first connection request from the portable terminal via the first interface, selects another communication device that is capable of communicating with the portable terminal when the first connection format is not allowed, and transmits to the portable terminal the connection information concerning the second connection format for communication with the portable terminal via the selected another communication device and the second interface.