Abstract: It is an object of the invention to provide a memory device including a memory area having a large storage capacity and an equal security level to that of a Smart card. A semiconductor memory card 10 that can be attached to and detached from an electronic device is provided with first memory 50 of non-tamper-resistance having usual areas 52 and 53 that can be accessed from the electronic device and a secure area 51 that cannot directly be accessed from the electronic device, and second memory 41 of tamper resistance that cannot directly be accessed from the electronic device, wherein access to the secure area 51 of the first memory 50 can be made only through a secure control section 30 for managing access to the second memory 41. The secure area 51 cannot directly be accessed by an external device and therefore has the higher security level than the authentication area 52. Since the secure area 51 is placed in the non-tamper-resistant memory 50, a large storage capacity can be reserved.

Abstract: An IP address recognizing unit determines whether or not an IP address of a mobile IP terminal whose charging information is to be processed is managed by a local station. If the IP address is not managed, a MobileIP-Server searching unit determines which station is the home station of the IP address. Then, a different station information transmission determining unit and a different station IP charging apparatus transmitting unit transmit the charging information to the apparatus that is a different station IP charging apparatus and the home station of the IP address. Additionally, a different station IP charging apparatus receiving unit receives the charging information of the IP address, and stores the charging information in a charging information database (for different station transmission) and manages the charging information.