This study names the system as Food Ordering System (FOS). Food Ordering System (FOS) is a computerize system that applies in a restaurant ordering service. This FOS involves in four subsystems, which is the waiter (tablet device), the cashier (system controller), the kitchen department (screen display), and the web service system. And also, the system is includes with two clients, that is PC client and mobile device client. On the PC client, it is divided into two parts that is one for the cashier that also act as the controller of the system and the other one is for the kitchen department. The connection between these three systems is using the wireless intranet. By using mobile device, it helps to make the system possible to increase to overall productivity of an organization. The mobile device will have to communicate with other systems, which are the server database, the cashier, kitchen department.