Nucleic acid is captured from a mixture of cellular debris produced by cell lysis by exposing the mixture to an electrode and applying a nucleic acid capturing voltage to the electrode which is then removed from the mixture carrying said nucleic acid. The method includes sensing an external environment of the display apparatus, determining a level of viewing concentration based on a result of the sensing, and displaying content by performing a power-saving processing operation at a level corresponding to the level of viewing concentration among a plurality of levels of the power-saving processing operation. In the preferred embodiment, the instrument is packaged in a sterile container for a single use. In one aspect, servers are arranged within a data center unit according to anticipated peak periods of usage.