An application producing method regarding a first and second application, the method includes receiving an application generation request related to a second application, the second application being subordinate to a first application, generating the second application and computer readable instructions related to a switch interface for selecting at least one of the first and second applications, the switch interface computer readable instructions related to the switch interface, which when executed by at least one application executing apparatus, causes the application executing apparatus to display the switch interface on at least one of the first and second applications, and when the switch interface is in a first state, the first application is controlled based on a first user input received by the at least one application executing apparatus, and when the switch interface is in a second state, the second application is controlled based on the first user input.