A network system and communication method of same, a communication system, an information relaying apparatus and method of the same, and an information providing apparatus, which prevent personal information from being revealed when requesting more detailed material from a web page providing apparatus, wherein when a user system views a web page established by a web page carrying computer, if the user clicks a "CALL ME" button for inquiry, an information input screen controlled by a button management computer is displayed; when the user inputs his or her ID and inquiry content etc. from there, this information is transferred to an information relaying system and an identification number that does not enable identification of the user system is attached and transferred as the inquiry information with respect to an information providing system; and, when the information providing system replies to the user, this identification number is converted to the ID for identifying the user by the information relaying system for the response.