1. An electronic power-measurement device with an intelligent agent comprising: a power measurement unit ( 110 ); an intelligent agent ( 120 ); and a communication unit ( 130 ), wherein the intelligent agent ( 120 ) includes: a device protocol interface ( 121 ) for performing data conversion such that the power measurement unit ( 110 ) and the intelligent agent ( 120 ) can exchange data therebetween, a data communication unit ( 122 ) for enabling data communication between the power measurement unit ( 110 ) and the intelligent agent ( 120 ), a communication module controller ( 123 ) for independently supporting a communication module when performing data communication with an external system, an agent engine ( 124 ) for controlling and monitoring the electronic power-measurement device, in which the agent engine ( 124 ) has a microprocessor and a memory unit, and an agent dedicated database ( 125 ) for maintaining data groups related to measurement and added services, and storing created, changed and deleted data therein.