Patent ID: 8284688

Claim:
A packet capture apparatus, comprising: the packet capture apparatus communicating with a computer including: a packet capturing part to receive packets through a packet communication network; a data extracting-storing part to acquire target packets including specific information from the received packets, extract the target packets of each session, and store the extracted target packets in a data storage part; a capture on-off time estimating part to estimate a capture cycle, a capture width, and a capture start time based on information indicating a reception state of the packets received by the packet capturing part and to determine a start time and an end time of reception of the packets based on the capture cycle, the capture width, and the capture start time, the capture cycle being a time period during which the reception of the packets is performed, the capture width being a time period during which the reception of the packets is continued, the capture start time being a time when the reception of the packets is started; a capture on-off time setting part to set the start time and the end time; and a capture on-off controlling part configured to set intermittent packet reception by the packet capturing part, and wherein the packet capturing part receives the packets during a time period from a time when the capture on-off controlling part instructs the capture start time to a time when the capture on-off controlling part instructs the end time of the reception.