Abstract: A retrieval keyword analyzing system extracts an access sequence indicating a continuous access by a same requester based on a Web access log which relates first identification data indicating an access requester to second identification data indicating contents to be accessed. The Web access log relates second identification data indicating a retrieval system to a retrieval keyword input to the retrieval system by the requester. The analyzing system extracts the retrieval keyword from the Web access log, calculates a qualitative evaluation value of the access sequence and creates relation data between the retrieval keyword and the qualitative evaluation value.

Abstract: A retrieval keyword analyzing system extracts an access sequence indicating a continuous access by a same requester based on a Web access log which relates first identification data indicating an access requester to second identification data indicating contents to be accessed. The Web access log relates second identification data indicating a retrieval system to a retrieval keyword input to the retrieval system by the requester. The analyzing system extracts the retrieval keyword from the Web access log, calculates a qualitative evaluation value of the access sequence and creates relation data between the retrieval keyword and the qualitative evaluation value.

Abstract: With an index that represents the content of a message, a communication band is assigned. At this point, communication bands are managed as fixed bands and variable bands. An index is used to secure a fixed band when the transmission a data flow corresponding to a communication request is started. In addition, an index is used to coordinate variable bands. Thus, priority levels of communication requests are objectively designated corresponding to the contents of communication requests and features of mediums. In the case that a fixed band and a variable band are secured, when a function for scheduling and reserving communication resources for communication requests is accomplished, priority levels are objectively designated with an index.