[Configured] (A) the present invention refers to using smart card device relates to in particular and method for electric charge automatic collection, predetermined amount of a sum of money is the prepaid electronic unit penetrating forward and backward to form of a pre-paid memory integrates to buy a smart card for old as a result, a card power purchase smart card and holder accepted when secret number and storing height input to make only subscriber to accurately number which can be supplied with a power, yet power the use of balance for that remains on a smart card is hereinafter predetermined amount to correct an outline depending on an amount of money the same time intervals different cut down by notifying a repair and of the controller for recharging by electronic unit penetrating forward and backward when a bus is in an open, is no real estate card inside some all power is used in a new card is rechargeable locks not protecting if power supply automatically power disconnecting can be protection against the unauthorised use of, card is is customary the microcomputer stores secret even if the use of any so that the cooperating means cannot be stealing card to user using power system computer of the present the discharge holes is formed inside the tie..