A subscription information processing method, a policy and charging control method, an online charging method, a visited network, a V-PCRF and a V-OCS, wherein, the subscription information processing method comprises: a visited network receiving visited network subscription information and account information of a roaming user, the visited network subscription information and the account information and home network subscription information and account information of the roaming user using the same user identification information; the visited network storing the visited network subscription information and the account information of the roaming user.