Patent ID: 8593947

Claim:
A congestion detection method for causing a computer to function as a congestion detection apparatus connectable to a network, the congestion detection method comprising: obtaining packets on the network; extracting a packet group made up of a series of packets based on the obtained packets; detecting a packet loss in the packet group and locating a temporal position within the packet group where the packet loss is occurring, wherein the temporal position indicates an order of a packet that the packet loss occurred when the packet group is transmitted as a sequence; and judging whether congestion is occurring based on the temporal position within the packet group where the packet loss is occurring, wherein the judging includes judging that congestion is occurring if the temporal position of the lost packet in the packet group is a position temporally posterior to a reference position in the packet group, and the reference position is any position, in terms of packet obtaining time in the obtaining of the packets on the network, in the packet group from a center position in the packet group to a position in a latter half portion.