Аннотация:Comprehensive analysis of the solar flare (Х1.5/SF, S05, W31) and solar proton events (SPE) of December 14, 2006 is carried out. We used spacecraft (SC) data on hard X-ray and gamma emissions, as well as measurements of the solar cosmic rays (SCR) on the orbit of the Earth (SC GOES). According to some estimates, a power-law index of the differential spectrum of solar protons at the Earth’s orbit in the energy range of 9-165 MeV was about 2.0. If one continues such a (rather hard) spectrum into relativistic range with the same slope, the event could be registered by the anticoincidence shield spectrometer on SC INTEGRAL (ACS SPI). In the temporal profiles of the counting rate of ACS SPI for this event we found out some features, indicating the possibility of relativistic particles registration. Ground-based network of neutron monitors on December 14 recorded no increase of SCR intensity. In this context, we discuss the ACS SPI "sensitivity" to SCR spectrum. According to our preliminary estimates, some fraction of energetic particles could be accelerated to relativistic energies in this event. The acceleration might proceed at the impulsive phase of the flare in the lower corona, and not at the front of CME-driven shock wave.