An application service server comprising: a selection unit that selects a second wireless provider used when an application service is provided to a wireless terminal device, the selection being made on the basis of a connection request transmitted from the wireless terminal device storing contract authorization information of a first wireless provider of a plurality of wireless providers providing a wireless connection service through a wireless line, the connection request being based on a user operation for using the application service, from the plurality of wireless provided and at least the content of the application service and a position of the wireless terminal device; and a control unit that controls rewriting instruction information for rewriting contract authorization information stored in the wireless terminal device into contract authorization information of the second wireless provider to be transmitted to the wireless terminal device, wherein after the contract authorization information stored in the wireless terminal device is rewritten into the contract authorization information of the second wireless provider, the control unit controls the transmission of the connection request which is the rewriting instruction information to the wireless terminal device by reconnection to the wireless line provided by the second wireless provider using the contract authorization information of the second wireless provider; wherein the connection request includes position information acquired by the wireless terminal device or position information corresponding to a position of a base station connected to the wireless terminal device, and wherein the selection unit 240) specifies the position of the wireless terminal device on the basis of the position information included in the connection request, extracts wireless providers capable of providing the wireless connection service at the specified position from the plurality of wireless providers, and selects the second wireless provider from the extracted wireless providers, and the selection unit selects the second wireless provider from the extracted wireless providers on the basis of at least one of a cost related to the wireless connection service provided by the extracted wireless providers, wireless connection quality related to the wireless connection service, and a congestion degree related to the wireless connection service, and the content of the application service, characterised in that: the control unit controls the rewriting instruction information to be transmitted from the wireless line provided by the first wireless provider to the wireless terminal device through the second wireless provider. a selection unit that selects a second wireless provider used when an application service is provided to a wireless terminal device, the selection being made on the basis of a connection request transmitted from the wireless terminal device storing contract authorization information of a first wireless provider of a plurality of wireless providers providing a wireless connection service through a wireless line, the connection request being based on a user operation for using the application service, from the plurality of wireless provided and at least the content of the application service and a position of the wireless terminal device; and a control unit that controls rewriting instruction information for rewriting contract authorization information stored in the wireless terminal device into contract authorization information of the second wireless provider to be transmitted to the wireless terminal device, wherein after the contract authorization information stored in the wireless terminal device is rewritten into the contract authorization information of the second wireless provider, the control unit controls the transmission of the connection request which is the rewriting instruction information to the wireless terminal device by reconnection to the wireless line provided by the second wireless provider using the contract authorization information of the second wireless provider; wherein the connection request includes position information acquired by the wireless terminal device or position information corresponding to a position of a base station connected to the wireless terminal device, and wherein the selection unit 240) specifies the position of the wireless terminal device on the basis of the position information included in the connection request, extracts wireless providers capable of providing the wireless connection service at the specified position from the plurality of wireless providers, and selects the second wireless provider from the extracted wireless providers, and the selection unit selects the second wireless provider from the extracted wireless providers on the basis of at least one of a cost related to the wireless connection service provided by the extracted wireless providers, wireless connection quality related to the wireless connection service, and a congestion degree related to the wireless connection service, and the content of the application service, the control unit controls the rewriting instruction information to be transmitted from the wireless line provided by the first wireless provider to the wireless terminal device through the second wireless provider.