A sample processing apparatus, comprising: a plurality of sample processing units each configured to process a sample; at least one transport device configured to provide a transport path along which a rack is transported to or from one of the plurality of sample processing units, wherein a rack comprises a plurality of positions configured to hold containers thereat, and at least some of the positions are correlated to at least some of the sample processing units; a controller comprising at least one processor and at least one memory that stores computer programs executed by the at least one processor to: direct the at least one transport device to transport the rack to deliver a container held therein to a sample processing unit correlated to a position of the container at which the container is held in the rack.