A train-information managing apparatus receives a series of control information attached to serial numbers, which are transmitted from a central apparatus, in order of the transmission and carries out control in the order, and even when the central apparatus is changed or the serial numbers are reset, prevents a blank period of control from occurring. Therefore, when a reception serial number n included in received data is a preferential serial number (n≦M) and an old number nprev, which is a serial number included in data received and stored last time, is a cyclic serial number (nprev≧M+1), the train-information managing apparatus stores the received data.