Patent ID: 8914448

Claim:
A method for requesting a disposition notification from a group member for an Instant Messaging (IM) message by a transmission client in a mobile communication system including the transmission client, an IM server and a plurality of target clients, the method comprising: generating an IM message, for delivery to the plurality of target clients, that includes information on at least two target clients designated by the transmission client among the plurality of target clients, which are requested to report reception of the IM message, information designating a first of a plurality of report types for each of the at least two target clients, and information designating a second of the plurality of report types for at least one of the at least two target clients, the second report type being different than the first report type, wherein the at least two target clients is fewer than the plurality of target clients, the plurality of target clients is at least three target clients, and the plurality of report types comprises a read report indicating whether the IM message has been checked, a delivery report indicating whether the IM message has been transmitted to each of the at least two target clients, and a processing report indicating whether the IM message has been processed by the IM server; transmitting the generated IM message to the IM server for delivery to the plurality of target clients; and receiving at least one report, corresponding to the at least one report type, from each of the at least two target clients through the IM server.