A signal processing apparatus 6 includes a mode selection unit 6124 that selects any operational mode from among a plurality of operational modes that include a regular operational mode in which a video signal for display is output, and are hierarchically organized in a tree form, the mode selection unit 6124 causing the signal processing apparatus 6 to operate in the selected operational mode. The operational modes include a plurality of lower-level operational modes as lower-level operational modes having a parent-child relation with the regular operational mode. The mode selection unit 6124, after the signal processing apparatus 6 has started up, selects any operational mode from among same-level operational modes for each level from an upper level toward a lower level and, when having selected any of the lower-level operational modes, can select an upper-level operational mode relative to the selected lower-level operational mode on condition that the signal processing apparatus 6 has again started up.