Vehicle information management system

A vehicle information management system having a structure that keeps a storage capacity from increasing and allows an abnormality and a malfunction to be specified easily is provided. A storage 24 has a storage region capable of storing abnormality data that includes diagnostic data, type information indicating a type of an abnormality, and occurrence number information that indicates the number of occurrences of the abnormality specified by the type information. When the type of an abnormality is specified by an abnormality specifying unit and a new pieces of diagnostic data is produced and if the abnormality data of the same type as the specified type is already stored in the storage region in the storage 24, an updating unit 234 changes the occurrence number information to the latest information and overwrites and saves the diagnostic data in the storage region already stored with the abnormality data of the same type as the specified type.