A signaling processor has a message transfer part for a Layer 2 operable to notify a message transfer part for a Layer 3 of a signal indicative of stop (release) completion of a link being connected when it receives a response to a request for a link release process after detection of a failure of the link being connected and notification of the request for the link release process to a correspondent signaling processor and a message transfer part for the Layer 3 operable to perform a retrieval process of a received signal that has not been retrieved and has been stored in the message transfer part for the Layer 2 when it receives the signal indicative of stop (release) completion of the link.