A service apparatus and method for providing a deferred message, and a storage medium. The service method for providing a deferred message comprises: receiving a message parameter sent by a first client and to be forwarded to a second client (S1); determining whether a user associated with the second client is online (S2); if the user associated with the second client is not online, determining that the message parameter to be forwarded is a message parameter of a deferred message, and saving the message parameter into a database of a server (S3); and when receiving an online prompt of the user associated with the second client, delivering the message parameter to the second client (S4). The method can significantly reduce the network traffic and occupation of the storage space.