There is provided an apparatus for generating a jamming signal for deceiving a transmission/reception device. The apparatus includes a reception unit configured to receive a signal transmitted from the transmission/reception device and a determination unit configured to determine whether or not the received signal is a pulse compression signal. The apparatus further includes a generation unit configured to determine, when the received signal is a pulse compression signal, a deception frequency based on a frequency bandwidth and a pulse width of the received pulse compression signal and generate the jamming signal based on the determined deception frequency.