A data analysis apparatus includes: a vehicle data communicator that obtains vehicle data indicating a vehicle status of a first vehicle; a external data communicator that obtains external data indicating external circumstances of the first vehicle from at least one of a second vehicle, which is in an area where the first vehicle is running and is different from the first vehicle, and a traffic infrastructure system; a processor; and a memory including at least one set of instructions. By executing the at least one set of instructions, the processor performs: a first determination as to whether there is an inconsistency between the vehicle status of the first vehicle indicated and the external circumstances, and outputs a result of the first determination regarding the first vehicle.