To provide a device which can easily correct plural programs by comparing and collating them by a graphic language.

This device is equipped with an input means 1 which inputs the programs, a communication means 2 which transmits the programs to a programmable controller 21, a storage means 3 which stores the programs in code format that can be reproduced into the graphic language for the programmable controller 21, a converting means 4 which converts the stored programs into the graphic language so as to display them as images, and a display means 5 which displays the converted programs, and generates a program to be inputted to the programmable controller 21. In this case, a comparing means 6 inputs plural programs from the storage means 3, compares their contents, and outputs a signal indicating a discrepant part to the display means 5.