Abstract: A system constituting an application platform, comprising: an application content manager that: causes developers to register filters in a filter store; enables a user who uses an AppWriter to use the registered filters; causes the AppWriter to provide a method for configuring a content process pipeline without coding; automatically processes the content while periodically executing the configured pipeline; and causes a general-purpose repository to store different kinds of contents, and an application generator that: causes a resource store to provide resources necessary for app-writing and operation; causes the AppWriter to provide a WYSIWYG-type UI capable of producing an application that provides a desired function and UI without a prior knowledge for creation of the application; causes an application renderer to output an application source to an UI adapted to the platform; and causes the content pipeline to provide a repository that stores the created content and operate repositories.