Communication controller and communication control method.

摘要

A portable terminal unit (3) is connected to a network such as a LAN to communicate with a host apparatus. The terminal unit never carries out useless communication control when the terminal unit is not connected to a transmission line (5) of the LAN or to an external power source (6). The terminal unit (3) has a decision unit (1) for determining whether or not the terminal unit is connected to the transmission line (5) and/or a decision unit (4) for determining whether or not the terminal unit is connected to the external power source (6). The terminal unit also has a communication controller (2) for starting to communicate with the host apparatus when the decision units (1, 4) determine that the terminal unit is connected to the transmission line and/or to the external power source.