There is provided a test apparatus for testing a device under test, including a receiving section that receives a packet from the device under test, a packet data sequence storing section that stores a data sequence included in each type of packet and received data included in the packet received by the receiving section, a transmission data processing section that reads data from the packet data sequence storing section and generates a test data sequence by adjusting a predetermined portion of a data sequence of a packet to be transmitted to the device under test to have a value corresponding to the received data, and a transmitting section that transmits the test data sequence generated by the transmission data processing section to the device under test.