A transmissive head-mounted display apparatus includes an image display unit configured to transmit an external scenery and display an image of a display target viewable with the external scenery, a kinetic information acquisition unit configured to acquire information about a muscle movement, detected by a muscle activity detection device configured to detect a muscle movement of a body of a user of the transmissive head-mounted display apparatus, a hand gesture estimation unit configured to estimate a hand gesture specified beforehand, based on the muscle movement indicated in the information that has been acquired, and an input signal generation unit configured to generate an input signal specified beforehand in accordance with the hand gesture that is estimated.
