The present invention is to prevent user's attribute information from being distributed, in the case where it is to be determined whether or not the attribute information (for example, age, address, and the like) of the user satisfies a service providing condition, when a communication session is established across multiple session managing servers.According to the present invention, attribute information of a user who is using a client logging in a session managing server, and attribute information of a service operating on the client are managed, a condition (SEP) to establish a communication session among multiple session managing servers related to the session establishment is shared, and the session managing server which manages the attribute information compares the attribute information and the SEP to make an access judgment, in order to determine whether or not the communication session is to be established.