An internet interface service system and method are capable of connecting portable mobile terminals of users (such as notebook computers, palm top computers, network computers, PDAs, and the like) to a communication (or internet) network in public places (such as airports, conference places, bus terminals and the like). In accordance with the system and method, the mobile terminals are connected via the communication network to any of a plurality of information providing servers for receiving information. A settlement server is provided for performing electronic settlements of communication connection charges for the mobile terminals. An internet interface unit is provided for enabling the mobile terminals to be connected to the communication network and for charging the users of the mobile terminals for the usage of the internet interface service system. A central management server manages the internet interface unit, allocates dynamic IP addresses when the mobile terminals of users are connected to the internet interface unit, and releases the allocated addresses upon termination of communication of the mobile terminals.