To provide a method and a system for paying price for automatic vending machine while utilizing portable telephone composed of a portable telephone set and an automatic vending machine with built-in MMP server, MMB server and MMS unit connected to a portable telephone line network.

When a user performs commodity purchasing operation while using an operating means 25, a transaction control means 22 sends transaction account data stored in an account storage means 23 to an MMS control means 10 and this MMS control means 10 temporarily registers the transaction account data and issues a control command for enabling commodity selection within a credit limit to an automatic vending machine control means 30. When the user selects a purchasing commodity, this commodity is ejected, the amount of transaction is reported, transaction data such as financial ID, account number and subtraction amount are sent via a packet communication center 7 to a relevant MMP server 5 and this MMP server 5 additionally registers the transaction data for each transaction and requests collection to an MMB server 6.