Patent ID: 7197507

Claim:
A communication information recording device, comprising: means for sequentially capturing packet data of a data stream traveling on an objective network, at prescribed monitoring time intervals, said packet data transmitted and received by a plurality of terminal devices connected to said objective network, and storing said captured packet data in first memory means with a monitor file name, said captured packet data each being in one of a plurality of application protocols; means for reading the packet data stored in the first memory means, based on the monitor file name; means for analyzing the packet data read, in order to find communication item data at least including a sender name, a receiver name and a main body of text, in accordance with said one of a plurality of application protocols, and storing analysis result data including the communication item data found in an analysis result database serving as second memory means; and means for extracting the analysis result data corresponding to a search request, from the analysis result database, in response to the search request given from the outside, and transmitting the analysis result data extracted to the outside for confirmation of contents of said data packets transmitted to the objective network in the past.