An adaptor device (6,30) connected to both a portable medical apparatus and a computer comprises: a first interface (18) which communicates at a first communication speed with the computer a second interface (11,31) which communicates at a second communication speed with the portable medical apparatus a communication control unit (15) for adjusting the speed between a signal exchanged by way of the first interface and a second signal exchanged by way of the second interface a first insulation unit (13), which electrically insulates between a terminal on the second interface side and a terminal on the communication control unit side, for outputting, to the communication control unit, the second signal input from the second interface and a second insulation unit (14), which electrically insulates between a terminal on the second interface side and a terminal on the communication control unit side, for outputting, to the second interface, a signal input from the communication control unit.
