Network system

A network system comprising:

• a service-provider server providing a browser service capable of running in a web browser;
• a user terminal being used by a user when the user creates an application program on a web browser;
• and
• an application-creation support server supporting the creation of the application program;
• the service-provider server, the user terminal and the application-creation support server being communicably connected via network,
• the application-creation support server including:
• a storage unit that stores an application-creation tool used for the creation of the application program;
• an application-generation unit that automatically generates an application file by using the application-creation tool and in response to a request from the user terminal,
• the application file being for causing the browser service provided by the service-provider server to run in the application program;
• a screen-data generation unit that generates screen data in response to a request from the user terminal,
• the screen data being for displaying a layout-editing screen on a web browser of the user terminal which has issued the request,
• the layout-editing screen including
• a source code region in which a source code of a layout file included in the application file is displayed, and
• a preview region for testing a screen layout defined by the layout file;
• a layout processing unit that changes the layout file based on an editing operation input by the user on the layout-editing screen;
• and
• a packaging unit that generates an executable file of the application program by using the application-creation tool and in response to a request from the user terminal, based on the generated application file, the executable file in which a plurality of files including the layout file that has been changed are packaged.