Integration device and integration method thereof

An integration device and an integration method thereof are provided. The integration device executes an artifact integration procedure to integrate the artifacts in a first database and the artifacts in the second database. Based on the access authority of each process role in the first database and the access authority of each process role added from the second database into the first database, the integration device further modifies a plurality of application programming interfaces associated with the integrated artifacts and modifies a plurality of processes according to the modified application programming interfaces. In addition, the integration device further executes a process role integration procedure to integrate the process roles of the first database and the process roles added from the second database into the first database.