Charge and discharge control device, charge and discharge control system, the charge and discharge control method, and program

External device information acquisition unit (142) acquires the charging identification information from the power supply source, to obtain a discharge detection information from the power supply destination. Power amount obtaining unit (144) acquires the amount of power supplied from the power supply source to the secondary battery. Charge state DB (161) stores in association with the charging identification information of the power source, the electric energy obtained by the power amount obtaining unit (144), the. Discharge Setting DB (162) stores the power supply source, and the power supply source from the dischargeable power charged to the secondary battery power supply destination, the discharge enable information representing. Discharge permission determination unit (145), based on the discharge permission information, the discharge power supply destination identified by the identification information, supplied from the power supply source identified by the charging identification information stored in the charge state DB (161) It has been determined whether it is possible to discharge power.