Cellular phone system, cellular phone terminal, private information protection method, private information protection program and program recorded medium

摘要

A cellular phone terminal 103 can be connected to both of a wireless cellular phone base station 104 that is a public network and a wireless LAN access pint 101 that is a private wireless network to be used by particular users. When the cellular phone terminal 103 enters a wireless area 102 of the private wireless network, the cellular phone terminal 103 activates at least one part of at least one data processing functions of an address book function 103a, a bookmark function 103b and a mailbox function 103c that handle private information for the cellular phone terminal 103. On the other hand, when the cellular phone terminal 103 moves outside the wireless LAN area 102 like a cellular phone terminal 106, at least one part of the function of the activated functions is non-activated or disabled. The activated/non-activated functions are differentiated depending on a plurality of the private wireless networks or the user of the cellular phone terminal.