A method for application management is provided. First, an original application is received. A license code is injected into the original application through a repackaging process to generate a repackaged application. Next, the repackaged application is published for a user device to download and install, wherein the user device executes a client program. When the user device executes the repackaged application, the license code sends a license check request to activate the client program to send a license check response according to license information of the repackaged application. The license check response indicates whether the repackaged application is allowed to be further executed. When the license check response indicates that the repackage application is not allowed to be further executed, the license code terminates the repackaged application.