An operation estimation apparatus includes a distance measurement unit configured to measure a distance for a predetermined range, a human-body processing unit configured to detect a person on the basis of a distribution of measured distances, a tracking unit configured to assign an identifier to each detected person, and a situation estimation unit configured to estimate reaction of the person on the basis of a human data height which is a value of a height direction included in the measured distance in a first period set by prompting the person to start and end hand raising, wherein the situation estimation unit measures the human data height for each person to which the identifier is assigned a plurality of times in the first period, extracts an identifier for which human data heights are in the predetermined range, and estimates the reaction of the person corresponding to the extracted identifier.