Abstract: A packet flow monitoring device, a packet data extraction device, an extraction data aggregation device, and a program for efficiently and highly accurately monitoring a packet flow in a video or audio communication system constructed by an Ethernet (registered trademark) frame or IP packet network. This packet flow monitoring device includes: a packet data extraction device that replicates all passing packets that pass through one or a plurality of specific network switches on the network and extracts and aggregates some predetermined pieces of information in the replicated passing packets to form and output an extraction data report packet; and an extraction data aggregation device that receives the extraction data report packet, analyzes the extraction data report packet so as to aggregate the predetermined pieces of information in the replicated passing packets included in the extraction data report packet for each packet flow, and records the aggregated information as aggregation data.

Abstract: A packet flow monitoring device, a packet data extraction device, an extraction data aggregation device, and a program for efficiently and highly accurately monitoring a packet flow in a video or audio communication system constructed by an Ethernet (registered trademark) frame or IP packet network. This packet flow monitoring device includes: a packet data extraction device that replicates all passing packets that pass through one or a plurality of specific network switches on the network and extracts and aggregates some predetermined pieces of information in the replicated passing packets to form and output an extraction data report packet; and an extraction data aggregation device that receives the extraction data report packet, analyzes the extraction data report packet so as to aggregate the predetermined pieces of information in the replicated passing packets included in the extraction data report packet for each packet flow, and records the aggregated information as aggregation data.

Abstract: A vehicle navigation system capable of retrieving a route interconnecting a starting location and a destination by way of en route points, the starting location, destination, and en route points being set by a user, and displaying a retrieved route on a map display screen, the system including: an operation analysis section 21 for determining whether settings are made to display the entire route interconnecting the starting location and the destination by way of en route points or to display a route on a per-segment basis, such as a route segment interconnecting the starting location and one of the en route points, a route segment interconnecting en route points, or a route segment interconnecting one of the en route points and the destination; and a display control section 24 which extracts, from among the retrieved route segments, a route segment along which the vehicle is currently driving when the display determination device determines that a route is to be displayed on a per-segment basis, to thereby ma