Patent ID: 8291080

Claim:
A session control device connected to a web site and a client terminal which accesses said web site through a network, comprising: a computer processor; and memory storing code configured to execute on said computer processor, said code comprising: an arrival rate calculating code configured to calculate, with a state of a session in each access to a reference page which is a page whose effect is large on arrival at processing whose importance in the web site is high as a stage, on each stage basis, an arrival rate which is a probability of arrival of a session at said processing whose importance is high on said stage basis; an arrival rate storage code configured to store said arrival rate on said stage basis; a setting code configured to set a reference arrival rate which is an arrival rate as a reference for limiting a session; a collation code configured to obtain, from said arrival rate storage code, said arrival rate corresponding to a stage of said session received from said client terminal and to compare said arrival rate with said reference arrival rate to determine whether to limit said session from said client terminal; a reference page candidate determining code for selecting, from among candidates for said reference page or combinations of candidates for said reference page which are selected from pages provided by said web site, a candidate for said reference page or a combination of candidates whose evaluation is the highest, a statistics code for calculating, with a state of a session when accessing a candidate for said reference page or a combination of candidates for said reference page as a stage, rates of arrival sessions which arrive at said processing whose importance is high and sessions yet to arrive with respect to each number of requests at each stage, and an evaluation code for evaluating to what extent an arrival session and a session yet to arrive are discriminated by a candidate or a combination of candidates for said reference page based on said rates of the arrival sessions and the sessions yet to arrive.