A blade server includes a management blade and managed blade. The management blade manages service data necessary for the service of an application. In the managed blade, the application is activated. The managed blade includes a service data list creation unit and service data list transmission unit. The service data list creation unit creates a service data list representing service data necessary for the service of the application. The service data list transmission unit transmits the service data list created by the service data list creation unit to the management blade. The management blade includes a service data transmission unit. The service data transmission unit transmits, to the managed blade, service data in the service data list transmitted from the service data list transmission unit before the service of the application starts. A service start method for a blade server is also disclosed.