A synchronizing system (100, 100b) including a first synchronizing device (40, 40a, 40b) and a second synchronizing device that transmit or receive a synchronous packet according to a synchronous protocol, perform a synchronous process, and synchronize a time with each other, the system (100, 100b) comprising: the first synchronizing device (40, 40a, 40b) including: a transceiving unit that transmits or receives the synchronous packet to or from the second synchronizing device; a synchronization control unit that acquires a difference between a time of an own device (40, 40a, 40b) and a time of the second synchronizing device based on the synchronous packet; a time-managing unit that corrects the time of the own device (40, 40a, 40b) based on the difference; a first clock signal-extracting unit that extracts a clock signal from a signal of a physical layer received from a communication path, the communication path transferring the synchronous packet between the first and second synchronizing devices (40, 40a, 40b, 20); and an abnormality notification unit that notifies the second synchronizing device of an abnormality when a status in which a failure has occurred in the communication path or a status in which the extracted clock signal has deteriorated is detected as the abnormality related to a process of synchronizing a time; and the second synchronizing device including: a transceiving unit that transmits or receives the synchronous packet to or from the first synchronizing device (40, 40a, 40b); a synchronization interval control unit that increases an interval at which the synchronous process is performed as the length of time during which the abnormality is not notified of increases; and a synchronization control unit that performs the synchronous process at the interval determined by the synchronization interval control unit. the first synchronizing device (40, 40a, 40b) including: a transceiving unit that transmits or receives the synchronous packet to or from the second synchronizing device; a synchronization control unit that acquires a difference between a time of an own device (40, 40a, 40b) and a time of the second synchronizing device based on the synchronous packet; a time-managing unit that corrects the time of the own device (40, 40a, 40b) based on the difference; a first clock signal-extracting unit that extracts a clock signal from a signal of a physical layer received from a communication path, the communication path transferring the synchronous packet between the first and second synchronizing devices (40, 40a, 40b, 20); and an abnormality notification unit that notifies the second synchronizing device of an abnormality when a status in which a failure has occurred in the communication path or a status in which the extracted clock signal has deteriorated is detected as the abnormality related to a process of synchronizing a time; and a transceiving unit that transmits or receives the synchronous packet to or from the second synchronizing device; a synchronization control unit that acquires a difference between a time of an own device (40, 40a, 40b) and a time of the second synchronizing device based on the synchronous packet; a time-managing unit that corrects the time of the own device (40, 40a, 40b) based on the difference; a first clock signal-extracting unit that extracts a clock signal from a signal of a physical layer received from a communication path, the communication path transferring the synchronous packet between the first and second synchronizing devices (40, 40a, 40b, 20); and an abnormality notification unit that notifies the second synchronizing device of an abnormality when a status in which a failure has occurred in the communication path or a status in which the extracted clock signal has deteriorated is detected as the abnormality related to a process of synchronizing a time; and the second synchronizing device including: a transceiving unit that transmits or receives the synchronous packet to or from the first synchronizing device (40, 40a, 40b); a synchronization interval control unit that increases an interval at which the synchronous process is performed as the length of time during which the abnormality is not notified of increases; and a synchronization control unit that performs the synchronous process at the interval determined by the synchronization interval control unit. a transceiving unit that transmits or receives the synchronous packet to or from the first synchronizing device (40, 40a, 40b); a synchronization interval control unit that increases an interval at which the synchronous process is performed as the length of time during which the abnormality is not notified of increases; and a synchronization control unit that performs the synchronous process at the interval determined by the synchronization interval control unit.