Disclosed is a remote monitoring terminal device (200) including: connection terminals (T, ...) a data storage control section (243) for storing, in a data storage section (260) at predetermined interval (TA), only a predetermined number of latest data sets in data fed via the connection terminals (T, ...) and a communications section (210), wherein in response to an occurrence of a predetermined event in the mobile work vehicle (110) or vessel, the data storage control section (243) stores in the data storage section (260) the predetermined number of data sets including a data set obtained upon the occurrence of the predetermined event and transmits the predetermined number of data sets stored in the data storage section (260), together with information indicating the predetermined event, to a remote monitoring device (130) via the communications section (210).
