In order to further develop a method for summarizing at least one data stream (12) as well as a corresponding data summarization system (100) comprising at least one receiving means (10) for receiving at least one data stream (12) in such way that at least one summary is available immediately after receiving of the data stream (12), in particular immediately after content acquisition and/or recording and/or encoding and/or decoding of the data stream without any post-processing operation, it is proposed to provide—at least one selecting means (30) for selecting part (32, 32′) of the data stream portions and at least one processing means (70) for generating at least one summary by summarizing at least part of the selected data stream portions (32′) in particular until at least one predetermined summary volume is obtained, wherein the summary is generated during the receiving of the data stream (12).