Power management system and power management method

A power management system comprising:

• a power supplying unit;
• a measuring unit configured to measure a power generation environment for the power supplying unit, wherein the power generation environment includes one or more measureable characteristics within an environment of the measuring unit;
• a communication unit configured to transmit information measured by the measuring unit;
• a memory configured to store information measured by the measuring unit during a period when the communication unit is out of operation;
• and
• a control unit configured to control the measuring unit and the communication unit,
• wherein
• the power supplying unit is used as a power source for the measuring unit and the communication unit,
• the control unit sets a first power threshold to be used for determining whether or not to switch operation states of the measuring unit, and a second power threshold, which is greater than the first power threshold, to be used for determining whether or not to switch operation states of the communication unit, on the basis of a power supply that is supplied from the power supplying unit,
• the control unit switches operation states of the measuring unit on the basis of results comparing the power supply with the first power threshold, and switches operation states of the communication unit on the basis of results comparing the power supply with the second power threshold, and
• the communication unit transmits the information stored in the memory when the communication unit is in operation.