Device management system and control method

Means position information analyzing unit management apparatus receives from the portable terminal based on the wireless communication unit of the terminal position information stored in the information storage unit to search means positioned relative to the apparatus within a predetermined distance of the portable terminal, which is located near the portable terminal . Energy information analyzing unit reads the information searched from the storage unit of the portable terminal device in the vicinity of usage information, and the information is transmitted from the wireless communication unit of the portable terminal to the information acquiring unit. Since only the energy information acquiring unit acquires the portable device is located in the vicinity of the terminal using the information, the display unit displays only the energy is located near the portable terminal apparatus usage information.