The present invention obtains an assistance
system capable of assisting with function setting of a
straddle-type vehicle by a rider, a portable
wireless terminal used for such an assistance
system, a control method for such an assistance
system, a control method for such a portable
wireless terminal, and a program run on such a portable
wireless terminal.In an assistance system (1), an acquisition section (51) of a portable wireless terminal (50) wirelessly acquires information on the function setting operated on an
input device (11) of a
straddle-type vehicle (10), and an input section (52) of the portable wireless terminal (50) provides a guidance corresponding to the information on the function setting operated on the
input device (11) of the
straddle-type vehicle (10) when accepting the operation of the function setting by the rider.