An information indication method and apparatus, information detection method and apparatus and communication system. The information indication apparatus includes: a first transmitting unit configured to transmit first indication information to UE indicating a position of a synchronization signal (SS)/physical broadcast channel (PBCH) block (SS/PBCH block) in a signal transmission period (an SS burst set); wherein, the first indication information includes at least two parts of information. Hence, the position of the synchronization signal in the signal transmission period by at least two parts information, so that frame timing at the UE side is supported, and currently existed problems are solved.