A terminal and base station side device, a terminal device, a base station, and a wireless communication method. The terminal side device includes: a searching unit, configured to adopt a synchronization signal sequence corresponding to a target frequency range to be searched to search a target cell; and a synchronization unit, configured to perform synchronization based on the synchronization signal detected by the searching unit to synchronize the device to the target cell, the case the target frequency range belongs to a first frequency range, the searching unit adopts the synchronization signal sequence in a first subset of a synchronization signal sequence set to search the target cell, the first subset being a proper subset of the synchronization signal sequence set. Thereby, a number of synchronization signal sequence matching in a cell searching procedure is reduced and time for user equipment to synchronize to the target cell is shortened.