FIELD: radio engineering, communication.
SUBSTANCE: system for transmitting a file from multiple sources in instant messaging (IM) comprises a sender IM terminal and a receiver IM terminal connected to each other through a network to exchange data; wherein the receiver IM terminal is configured to search for replicas of a file according to file information sent by the sender IM terminal, and when at least one replica is found, to receive the file from at least two file sources by using a multi-source transmission mode, wherein the at least two file sources comprise the sender IM terminal and a file source of the at least one replica.
EFFECT: faster file transmission and high degree of bandwidth utilisation.
16 cl, 8 dwg
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