HYDROGEN FILLING MONITORING SYSTEM AND HYDROGEN FILLING METHOD

A hydrogen filling monitoring system WS includes a hydrogen fuel cell railway vehicle 3, an external power supply 120, and a tablet terminal (monitoring terminal device) 100. The tablet terminal 100 constituting the hydrogen filling monitoring system WS includes a power receiving unit 107 that receives supply of power from the external power supply 120, and acquires monitoring information on a hydrogen supply system 10 from a control device 11 of the hydrogen supply system 10 provided in the hydrogen fuel cell railway vehicle 3. The tablet terminal 100 displays the acquired monitoring information on a display unit 104.