A data collection device according to an aspect of the present disclosure includes: at least one memory storing a set of instructions; and at least one processor configured to execute the set of instructions to: detect a target data point that is a data point at which a target is observed in acoustic data obtained by observation of the target; determine an analysis range in the acoustic data based on the target data point; detect an abnormality in the analysis range; and output information of the analysis range in which the abnormality is detected.