ELECTRIC POWER MANAGEMENT SYSTEM AND ELECTRIC POWER MANAGEMENT METHOD

A power management system for providing a mechanism of power transaction between two or more facilities connected to a power grid, the system includes a controller configured to extract, from the two or more facilities, a power selling facility other than a power purchasing facility by an input from a user terminal corresponding to the power purchasing facility which is one of the two or more facilities, and calculate a score indicating a value of the power transaction based on a communication time in a communication path between the power selling facility and the power purchasing facility, and a notification unit configured to notify the user terminal of the score.