A terminal device includes a controller configured to: transmit, to a device management server, an account information item having been registered in the device management server; receive, from the device management server, a target identification information item being for identifying a target device having been provisionally registered in association with the account information item, being unique identification information and being different from an IP address of the target device, and being assigned to the target device in advance before the target device is connected to a LAN where the terminal device is connected; specify the target device identified by the target identification information item from one or more devices connected to the LAN; and execute a formal registration process for formally registering the specified target device associated with the account information item in the device management server.