A packet communication system includes a first communication apparatus and a second communication apparatus. The first communication apparatus generates one or more data packets each having its data volume not more than a prescribed data volume, and transmits the generated data packets to the second communication apparatus. The second communication apparatus receives the data packet transmitted from the first communication apparatus, in order of transmission. The first communication apparatus generates the data packets to be transmitted to the second communication apparatus such that one of the data packets to be last transmitted is a short packet having its data volume less than the prescribed data volume, and each of the data packets other than the data packet to be last transmitted has its data volume equal to the prescribed data volume. The second communication apparatus determines whether or not the data packet received each time is a short packet. Thereby, the second communication apparatus can determine that the data packet transmitted last has been received.