To change (repair) a software of a TID terminal unit in even a railroad section of an operation for 24 hours when requiring the software to be changed due to a linear change, etc.

In this train operating situation display device, TID information prepared in a TID central device installed in a CTC center is transmitted to the TID terminal unit installed at each station and a prescribed place of an industrial civil service organization via a communication line to display the TID information transmitted to the TID terminal unit. The display device is constituted of a maintenance device provided on the CTC center for repairing the software for the TID terminal unit and preparing the repaired software, a transmission means for transmitting data of the prepared repaired software in parallel to the TID information to the TID terminal unit via the communication line, and a setting means for setting the repaired software to the TID terminal unit when the TID terminal unit receives the data of the repaired software.