Terminal switching method, access device, terminal, and system

An access device, wherein the access device comprises:

• a first connection establishment module, configured to:
• when a distance to a second access device falls within a range of a near field communication NFC connection, establish an NFC connection to the second access device;
• an authentication parameter receiving module, configured to receive an authentication parameter of a to-be-switched terminal that is sent by the second access device by using the NFC connection, wherein the to-be-switched terminal is a terminal that has established a first connection to the second access device;
• a request receiving module, configured to receive an authentication request sent by the to-be-switched terminal;
• an authentication module, configured to perform access authentication on the to-be-switched terminal according to the authentication parameter;
• and
• a second connection establishment module, configured to:
• after the authentication by the authentication module succeeds, establish a second connection to the to-be-switched terminal.

A terminal, wherein the terminal comprises:

• a request sending module, configured to send an authentication request to a first access device, wherein the authentication request is used to instruct the first access device to perform access authentication on the to-be-switched terminal according to an authentication parameter, wherein the authentication parameter is a parameter that is sent to the first access device by the second access device by using a near field communication NFC connection;
• and
• a fourth connection establishment module, configured to:
• after the authentication by the first access device succeeds, establish a second connection to the first access device.