A mobile communication apparatus includes an abnormality detecting unit that detects whether or not there is an abnormality on a route; and a communication unit. When second abnormality detection information which differs from first abnormality detection information that indicates the detected abnormality has been received, it is determined that whether or not the abnormalities indicated by both information items coincide with each other. If it is determined that both abnormalities coincide with each other, then whether or not it is necessary to transmit the first abnormality detection information is determined based on a positional relationship between a position of the own apparatus and an occurrence point of the abnormality at the time when the abnormality indicated by the second abnormality detection information was detected.