A push service system is provided with data servers which are connected to an Internet and post information about updating information in storage sections to an agent, an agent which is connected to the Internet and when the information about updating is information about updating requested by registered user terminals, post the information about updating to the registered user terminals, and the user terminals which are connected to the Internet and receives the information about updating from the agent and access to the data servers which have posted the information about updating so as to obtain contents of the updated information.