According to one embodiment, a terminal device is provided, comprising: a first communication unit communicating with a network device by receiving a destination address of a server and identification information for identifying the network device, and receiving transmission data of the network device to the server and the identification information; a device information storage unit that stores the destination address in association with the identification information; a second communication unit communicating with the server, by transmitting the transmission data received from the network device to the server using the destination address that corresponds to the identification information in the device information storage, and receiving from the server a result of determining whether the transmission data transmitted from the second communication unit matches the transmission data that the network device transmits to the server; and a display unit that displays the result of the determination.