A parallel meter-reading method between a concentrator and electricity meters includes determining a phase of electric power supplied from a concentrator to the electricity meters, generating a reference signal synchronized with electric power determined for each phase, generating a request signal synchronized with the 3 phases electric power determined and transmitting the generated request signal to an electricity meter modem, receiving the request signal, determining a phase of electric power supplied to the electricity meter according to the request signal, generating a response signal synchronized with the determined phase and transmitting the generated response signal to the concentrator modem, and receiving the response signal of the electricity meter modem with respect to the request signal, and determining whether or not the response signal is synchronized with the reference signal to determine the phase of electric power supplied to the electricity meter.