One embodiment of the present invention provides a method for communicating with another device using a first device having a converged personal network service (CPNS) enabled entity. The communication method comprises: a step for determining whether the mode of the CPNS enabled entity needs to be changed from gateway mode to coupling mode; and a step for changing the mode of the CPNS enabled entity from the gateway mode to the coupling mode, according to the results from the step for determining. When changed to the coupling mode, the CPNS enabled entity operates in personal network entity (PNE) mode to receive from the second device data for service of a second network, and the gateway mode to transmit the received service data to at least one of the entities that belong to a first network managed by the CPNS enabled entity. The communication method can include a step for controlling the synchronism of the CPNS enabled entity operating in the gateway mode and at least one of the entities, considering the synchronism of the CPNS enabled entity operating in the PNE mode and the second device.