PURPOSE: A mash-up block-using device element synchronized mobile web application service allows a non-expert user to design a mash-up workflow and a user interface using a WYSIWYG (what you see is what you get) program, use a web application accessing and using a local device's resources, and easily develop mash-up contents on a PC and a smartphone. CONSTITUTION: A service management device stores information about a service. Connected to a user device and a provider device via a communication network, the device receives and transmits data using a designated protocol. When a service error occurs, the device generates alternative service recommendation information after searching for the service information. The device transmits the alternative service recommendation information to the user device.
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