We Claim:
1. An information processing device comprising:
an identification data acquirer to acquire (i) first classification information indicating a classification of equipment mounted on a train, (ii) first positional information including a formation number of the train, and (iii) an equipment identification number unique to the equipment that are output from a maintenance terminal used by a worker;
a vehicle management data acquirer to acquire as an output by a vehicle management device mounted on the train (i) second classification information indicating a classification of the equipment, (ii) second positional information including a formation number of the train, and (iii) equipment state information indicating a state of the equipment; and
a state history identifier to associate the equipment state information and the equipment identification number with each other upon determination that (i) the first positional information and the second positional information match each other, and (ii) the first classification information and the second classification information match each other.
2. The information processing device according to claim 1, wherein the first classification information and the equipment identification number are acquired by the maintenance terminal from an ID tag disposed on the equipment, and are generated by the maintenance terminal or the state history identifier.
3. The information processing device according to claim 1 or 2, wherein
the maintenance terminal receives electromagnetic or acoustic waves generated by an in-formation position notifier disposed in the train, and
the first positional information is generated by the maintenance terminal or the

state history identifier.
4. The information processing device according to any one of claims 1 to 3,
wherein
the first positional information and the second positional information each further include information indicating an installation position of the equipment within the train, and
the state history identifier determines whether the first positional information and the second positional information match each other by, in the comparison between the first positional information and the second positional information, (i) comparing the formation number obtained from the first positional information and the formation number obtained from the second positional information, and (ii) further comparing the installation position of the equipment obtained from the first positional information and the installation position of the equipment obtained from the second positional information.
5. The information processing device according to claim 4, wherein
the information of the first positional information indicating the installation
position of the equipment is generated by the maintenance terminal or the state history identifier based on (i) a signal reception strength of electromagnetic or acoustic waves received by the maintenance terminal and emitted by the in-formation position notifiers disposed on the train and (ii) positional information of the in-formation position notifiers.
6. The information processing device according to any one of claims 1 to 5,
wherein when the state history identifier determines (i) that the first positional
information and the second positional information match each other, and (ii) that the first
classification information and the second classification information match each other, the

state history identifier further associates the equipment identification number and the equipment composition information with each other, the equipment composition information having (a) the second classification information and (b) the second positional information including the formation number of the train.
7. The information processing device according to any one of claims 1 to 6, wherein the state history identifier sends to the maintenance terminal notification of the second classification information and the second positional information corresponding to the equipment state information for which the equipment identification number is not associated.
8. An information processing system comprising:
the information processing device according to any one of claims 1 to 7;
a vehicle management device to be mounted on the train, collect the equipment state information of the equipment, and output to the information processing device the equipment composition information and the equipment state information; and
a storage to store the associated equipment state information or the associated equipment composition information.
9. An information processing method comprising:
acquiring, by an identification data acquirer, as an output from a maintenance terminal used by a worker, (i) first classification information indicating a classification of equipment mounted on a train, (ii) first positional information including a formation number of the train, and (iii) an equipment identification number unique to the equipment; and
using, by a state history identifier, (i) second classification information indicating a classification of the equipment, (ii) second positional information including a formation

number of the train, and (iii) equipment state information indicating a state of the equipment that are output by a vehicle management device mounted on the train, to associate, upon determination that (i) the first positional information and the second positional information match each other, and (ii) the first classification information and the second classification information match each other, the equipment state information and/or the equipment composition information with the equipment identification number.