| CPC G06F 3/017 (2013.01) [G06F 3/0346 (2013.01); H04N 23/633 (2023.01)] | 11 Claims |

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1. A trigger signal generating apparatus for generating a trigger signal indicating a timing when a gesture is performed on a portable terminal, the trigger signal generating apparatus comprising:
a motion sensor for detecting motion information in each of three axial directions of a coordinate system having the portable terminal as an origin;
memory storing instructions; and
one or more processors that, with the instructions, configure the trigger signal generating apparatus to:
generate the trigger signal at a timing when a positive/negative sign of one of three pieces of motion information detected by the motion sensor becomes different from the remaining two positive/negative signs and when the three pieces of motion information respectively reach a peak substantially synchronously.
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