A test apparatus main body mounted in a single housing has a connection unit, a common bus, terminal control units, measurement units, and a total control unit. The connection unit can connect at least two terminals of identical or different type of communication systems. The terminal control units output test signals including signals that respectively control the terminals which can be connected to the connection unit based on predetermined test programs according to the type of communication systems, and measurement instructions, which are supplied via the common bus. The second measurement units perform measurements designated by the measurement instructions upon reception of response signals which are output from the terminals in response to the test signals from the terminal control units. The total control unit supplies, in advance, the predetermined test programs according to the type of communication systems and outputs the measurement instructions at predetermined timings to the terminal control units.