A packet communication method according to the present invention includes the steps of: starting, at a predetermined sublayer of a receiving-side apparatus, a reordering timer, when receiving a second packet before receiving a first packet in a case where a sequence number of the first packet is smaller than a sequence number of the second packet; and transmitting, at the predetermined sublayer of the receiving-side apparatus, a retransmission request for the first packet, when not receiving the first packet until the reordering timer expires.