We performed the resonant inverse photoemission (RIPE) study on CePd3 at the prethreshold region of the Ce-N-4,N-5 absorption edge. The surface effects on RIPE spectra are discussed through the investigation of the resonance behaviors. Comparison between the RIPE spectra and the calculated resonant-excitation probability of the intermediate states indicates the existence of specific excitation energy range, where a strong resonant enhancement occurs for the bulk or the surface 4f spectrum.