A power management apparatus for power management of a communication equipment comprising a plurality of modules and a plurality of power supply units, characterized by comprising: a system energy-saving controller, configured to obtain a power demand value of each module in the communication equipment and a rated output power of each power supply unit, PSU, in the communication equipment, calculate the obtained power demand value of each module to acquire a total power demand value of the communication equipment, and output the total power demand value of the communication equipment and the rated output power of each PSU to a power energy-saving control logical unit; and the power energy-saving control logical unit, configured to adjust, according to the total power demand value of the communication equipment and the rated output power of each PSU output by the system energy-saving controller, the current number of the PSUs actually turned on in the communication equipment; wherein the power energy-saving control logical unit is configured to determine a number of PSUs currently required to be turned on in the communication equipment, and wherein the number of PSUs currently required is equal to the total power demand value of the communication equipment divided by the rated output power of each PSU in the communication equipment when the total power demand of the communication equipment divided by the rated output power of each PSU in the communication equipment is equal to an integer, further wherein the number of PSUs currently required is equal to a sum of "1" and an integer portion of the total power demand value of the communication equipment divided by the rated output power of each PSU in the communication equipment when the total power demand value of the communication equipment divided by the rated output power of each PSU in the communication equipment is not equal to the integer, and further wherein the power energy-saving control logical unit is configured to adjust the current number of the PSUs actually turned on in the communication equipment to the determined number of PSUs currently required to be turned on in the communication equipment. a system energy-saving controller, configured to obtain a power demand value of each module in the communication equipment and a rated output power of each power supply unit, PSU, in the communication equipment, calculate the obtained power demand value of each module to acquire a total power demand value of the communication equipment, and output the total power demand value of the communication equipment and the rated output power of each PSU to a power energy-saving control logical unit; and the power energy-saving control logical unit, configured to adjust, according to the total power demand value of the communication equipment and the rated output power of each PSU output by the system energy-saving controller, the current number of the PSUs actually turned on in the communication equipment; wherein the power energy-saving control logical unit is configured to determine a number of PSUs currently required to be turned on in the communication equipment, and wherein the number of PSUs currently required is equal to the total power demand value of the communication equipment divided by the rated output power of each PSU in the communication equipment when the total power demand of the communication equipment divided by the rated output power of each PSU in the communication equipment is equal to an integer, further wherein the number of PSUs currently required is equal to a sum of "1" and an integer portion of the total power demand value of the communication equipment divided by the rated output power of each PSU in the communication equipment when the total power demand value of the communication equipment divided by the rated output power of each PSU in the communication equipment is not equal to the integer, and further wherein the power energy-saving control logical unit is configured to adjust the current number of the PSUs actually turned on in the communication equipment to the determined number of PSUs currently required to be turned on in the communication equipment.