An electronic power-measurement device with intelligent agent includes a power measurement unit, an intelligent agent and a communication unit. The device can commonly assess data necessary for works, as an intelligent agent is mounted on the electronic power-measurement device, although the manufacturers of the devices and hardware structure based on types of the devices are different from each other. Also, the device can select only data suitable to a high level service and can selectively assess thereto, in order to minimize extraction of unnecessary data when assessing data necessary for works, as the entire data structure is previously designed in tree form, such that each step of the tree can be used as address assess to corresponding data.