An embodiment provides system for managing a distribution network, the system including: a plurality of energy routers configured to control the amount of router power flowing between the distribution network and internal resources; and a distribution network management apparatus configured to transmit a command value for the amount of router power, which is produced according to variability of the distribution network, to the energy router while adjusting a communication cycle of the command value depending on a control success rate of the energy router for the command value.