The present invention discloses a server receives an access request sent by an information requesting terminal, where the access request carries information about a shared resource that the information requesting terminal requests to access; the server periodically sends a first authentication identifier to the information requesting terminal; the information requesting terminal sends the first authentication identifier to an information management terminal according to the received first authentication identifier; the information management terminal sends a second authentication identifier to the server; the server determines, whether the first authentication identifier sent to the information requesting terminal matches the second authentication identifier; if the first authentication identifier sent to the information requesting terminal matches the second authentication identifier, the server determines access permission of the information requesting terminal. According to the technical solutions provided in the present invention, access by an information requesting terminal is confirmed periodically, thereby implementing secure privacy protection.