Enabled is operation, including confirmation of the data content of a PC card on a display screen or outputting the data onto an output unit, according to the operation of another terminal unit connected to a network. A module to be removably inserted by a PC card and an output unit for displaying and printing input data are connected through an interface. The module and a terminal unit are connected for data transmission and reception through a communicating unit for communicating data on a predetermined communication protocol. By inserting the PC card in the module, the data of the PC card is converted into a data form to be data-processed on the output unit and into a data form suited for a communication protocol of the communicating unit.