There is provided a method comprising: receiving a request for information on electronic products from a first mobile communication terminal over a mobile communication network and providing information on a list of electronic products; receiving a request for payment for an electronic product selected from the provided information on the list, and transmitting a payment result after carrying out payment procedures for the selected electronic product; storing the paid electronic product in a joint account; receiving a request for access to the joint account from a second mobile communication terminal and determining whether or not to allow the access to the joint account; and receiving a request for checking availability of some of the electronic products stored in the joint account from the second mobile communication terminal and checking the availability of the requested electronic products.