A method for communication of a componentized application is described, including acquiring, by the source routing bus component, a routing message to be sent, in response to a message type of the routing message being an out-of-app message to be sent to a first target component included in a target application, establishing, by the source routing bus component, an external binding routing by binding a remote service, the external binding routing being a message transmission path between the source routing bus component and a target message dispatch service component in the target application to which the routing message is to be sent, and sending, by the source routing bus component, the routing message to the target message dispatch service component through the external binding routing, so that the first target component in the target application obtains the routing message.