In order to enable a user to obtain information about a large number of recorded images, a display apparatus includes a browser window that can be switched between two modes. The controller includes a contact point obtainer that obtains a contact point location of a surface of the measured object and the gauge head based on a central location of the gauge head; a radius of the gauge head; and a swing amount of the gauge head. The circuit elements can be located directly in, or operatively coupled to, the transmit signal path. By way of example, the additional information may be license information andor securities registration information for the agent.