Account logon method, account logon device and terminal device

The present invention discloses an account logon method, an account logon device and a terminal device. The method comprises sending a notification message to a second terminal device when a first terminal device detects that at least one second terminal device within the same local area network logs on the same account; the notification message carrying account information of the account; receiving an answer message sent by the second terminal device according to the account information, the answer message being a message sent when the second terminal device authorizes usage of the account by the first terminal device; and the answer message being used for indicating that the account is logged on at the first terminal device. The account logon convenience is raised.