A service managing system comprises: order terminals for enabling customers to view contents of service items and to order desired items, and being portable and driven by a battery; order-receiving terminals for receiving and indicating orders from the order terminals; an accounting unit for casting accounts in response to a customer's request and indicating a calculated result; and a control unit for processing data between the order terminals, order-receiving terminals and an accounting unit. In the system, data are transmitted and received using radio communications between the order terminals, order-receiving terminals, accounting unit and control unit. When an ordered item or service is ready, it is indicated on the order terminal via the order receiving terminal.