Provided is session control which enables profits of a web site to be optimized when accesses avalanche to the web site.A session control device connected to a web site and a client terminal which accesses the web site through a network, which includes a calculation unit for calculating, 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, a tendency of a session toward the processing whose importance is high on a stage basis, a storage unit for storing a calculated tendency toward the processing whose importance is high, a setting unit for setting a reference for limiting the session, and a collation unit for obtaining, from the storage unit, a tendency toward the processing whose importance is high with respect to a stage of the session received from the client terminal and comparing the tendency with the reference to determine whether to limit the session from the client terminal.