A terminal apparatus in a wireless communication system that includes the terminal apparatus, a base station apparatus, and a relay device configured to perform frequency conversion of a signal of a first frequency transmitted by the terminal apparatus to a second frequency and amplification of the signal and relay the resulting signal without performing demodulation and decoding is provided. The terminal apparatus notifies the relay device of information indicating, among a plurality of frequencies, a frequency to be used as the second frequency when the relay device relays, to the base station apparatus, a signal transmitted by the terminal apparatus.