An apparatus and a method used for supporting online upgrade

The invention provides an apparatus and a method used for supporting online upgrade. In an upgrade process, interaction with a user is maintained and an access request of a user is obtained; the access request acquired in the upgrade period is cached; after the update is over, the cached access request is processed. Thus, the user does not perceive the upgrade process, and the user experience of full-time uninterrupted service of user apparatuses is realized. Further, the invention also provides a network apparatus and a method used for supporting online upgrade of user apparatuses, which can manage upgrade processes of user apparatuses and thus improve the operation and maintenance performance in the upgrade process.