The invention provides an indium adsorbent that can cause indium to be adsorbed, and a simple and inexpensive indium fractioning method for isolating and recovering high-purity indium from an acid solution whose primary component is hydrochloric acid and that contains indium. A secure shell daemon server establishes the user authentication process with a secure shell client such that the user authentication process is associated with a user and the user is authenticated. The set of instructions stored in the reserved portion is executed to transition the computer system from the first power state to the second power state in response to a wakeup event. Chirps transmitted by the loudspeaker travel by different paths due to reflection from TILS or thermal inversion layers at different altitudes.