Developing applications online

The method and equipment for offering the operating system based on the network for mobile clients are indicated. The service which can be used in order to support various pieces of client equipment with which capability differs can be developed. Service gives two or more modification to an output based on various pieces of equipment, and chooses the most suitable modification for the equipment with which a medium requires. Since online software development system is offered, the service can use only the browser of a client side, and can create, edit, test and mount application in a medium. Since other services can also provide the service which can be accessed and referred to, the combination of different service becomes easy. The service can use mapping to a variable and the variable of the data memorized, can memorize data to a medium, and can access data with a medium. The data memorized by the medium can be used and an end user can be made to return to the service accessed before.