Patent ID: 8725877

Claim:
A session control device connected to a web site and a client terminal which accesses said web site through a network, comprising: a processor; and a memory; wherein said processor implements: an occupancy rate calculating unit 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, 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; a determination unit configured to set the limited number of requests on a stage basis such that the largest number of sessions yet to arrive can be rejected within a range in which a rate of rejection of an arrival session is not less than a minimum guaranteed rate indicative of a rate of arrival sessions which are not limited; and a collation unit configured to count the number of requests at a stage of said session received from said client terminal and configured to compare said number of requests counted and said limited number to determine whether to limit said session from said client terminal; wherein: when said number of requests fails to exceed said limited number, said collation unit transfers said session to said web site; and when said number of requests exceeds said limited number, transmits, to said client terminal, a response message notifying that said session is limited.