Patent ID: 7640039

Claim:
A wireless communication terminal synchronization method in which data stored in a memory in each of plural wireless communication terminals is synchronized with each other, when a user selectively utilizes the plural wireless communication terminals by using a single subscriber information card, at least communicating operation in each of the wireless communication terminals being enabled by mounting thereon the subscriber information card that records subscriber information, the method comprising the steps of: uploading from a first wireless communication terminal with the subscriber information card being mounted, to a server via a communication network, updated part of data which is stored in a memory in the first wireless communication terminal, in accordance with a user's request or automatically, said uploading being performed with only data updated after the subscriber information card was mounted on the first wireless communication terminal, while leaving the uploaded data in the memory in the first wireless communication terminal even when the subscriber information card is dismounted from the first wireless communication terminal, wherein said uploading is allowed to be executed at least under conditions that the user is confirmed to be an authenticated user of said subscriber information card and an authenticated user of the first wireless communication terminal; updating contents in a user's data storage area with the data being uploaded, in the server; downloading the data to a second wireless communication terminal via the communication network from the server, the data being confirmed in accordance with a user's request or automatically, as data to be downloaded to the second wireless communication terminal from the server, after the subscriber information card having been demounted is mounted on the second wireless communication terminal, said downloading being performed with only data which is present in the storage area of the server and which is not present in the memory of the second wireless communication terminal, wherein said downloading is allowed to be executed at least under conditions that the user is confirmed to be an authenticated user of said subscriber information card and an authenticated user of the second wireless communication terminal; and updating the contents of the memory in the second wireless communication terminal, said uploading being performed with only data updated after the subscriber information card was mounted on the second wireless communication terminal, while leaving the uploaded data in the memory in the second wireless communication terminal, wherein said uploading is allowed to be executed at least under conditions that the user is confirmed to be an authenticated user of said subscriber information card and an authenticated user of the second wireless communication terminal.