A station address displayed in a display field coincides with a station address of a PLC (Programmable Logic Controller) to which a personal computer is connected. Further, bit addresses of respective output variables are displayed in a display field. For example, a corresponding bit corresponding to a check box whose address of the output variable is 00L1E and whose station address of the destination PLC is 2 is an output schedule definition bit in an output schedule definition frame stored in a first storage. Therefore, a value of the output schedule definition bit is defined as 0 (: output is not scheduled). When an OK button is clicked, respective output schedule definition frames defined correctly are transferred to a PLC and then are stored in the first storage respectively.