Provided is a surface communication apparatus that includes: propagation sheet through which electromagnetic waves are propagated; an electromagnetic wave transmission unit disposed on a surface of propagation sheet to transmit the electromagnetic waves to propagation sheet, and an electromagnetic wave reception unit disposed on the surface of propagation sheet to receive the electromagnetic waves propagated through propagation sheet. The electromagnetic wave transmission unit includes an electromagnetic wave generator, and a transmission electromagnetic wave coupler that couples electromagnetic waves generated by the electromagnetic wave generator with propagation sheet. The electromagnetic wave reception unit includes a reception electromagnetic wave coupler that couples the electromagnetic waves propagated through propagation sheet, and an electromagnetic wave output unit that outputs the electromagnetic waves coupled by the reception electromagnetic wave coupler. Propagation sheet has a periodic structure that sets wavelengths of the electromagnetic waves propagated through propagation sheet to be longer than the length of propagation sheet in its extending direction.