NOVELTY - The system (100) has the power interchange apparatuses (102a-102h) that are connected through a system power supply line (160). A calculating unit is made to run a predetermined computer program. The predetermined information is acquired from interchange apparatuses through a communication-apparatus control unit (113) and stored in a memory unit (114). The group for accommodating electric power is produced by selecting a predetermined power interchange apparatus in several numbers out of each power interchange apparatus based on predetermined information stored in memory unit.    USE - System for managing power interchange from distributed power supply such as sunlight and wind power generations, and storage battery to house.    ADVANTAGE - The predetermined information is acquired from interchange apparatuses through communication unit and stored in memory unit such that the group for accommodating electric power is produced by selecting a predetermined power interchange apparatus in several numbers out of each power interchange apparatus based on the predetermined information stored in memory unit when the power interchange apparatuses is provided with the electric power for power transmission control so as to suppress the generation of situation where the power interchange is not started since the precondition required to actually perform power interchange control is lacked. Thus, the generation of phenomenon in which power interchange is not performed owing to lack of fundamental electric power required for transfer of electric power is suppressed effectively while improving the usability of system by using the memory capacity of the memory device efficiently.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for managing power interchange.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic block diagram of the power interchange network system. (Drawing includes non-English language text)    System for managing power interchange (100)    Power interchange apparatuses (102a-102h)    Communication-apparatus control unit (113)    Memory unit (114)    System power supply line (160)