PROBLEM TO BE SOLVED: To provide an environment understanding device and an environment understanding method that realize guidance on work procedures without requiring a user to preliminarily input information about work.SOLUTION: An environment understanding device 1 comprises: a language processing part 41 that analyzes information including multiple working processes about work and then creates a flow graph; a probability modeling part 42 that converts the working processes included in the created flow graph into a process model with those arranged in chronological order, on the basis of a prescribed standard; a sound recording part 50 that records a sound signal; a sound model that is created on the basis of the sound signal corresponding to each working process; a feature quantity extraction part 22 that extracts a sound feature quantity from the recorded sound signal; and an estimation part that infers a current working process being a working process at the current moment, on the basis of the sound feature quantity and the sound model, and then estimates work on the basis of the inferred current working process, a working process estimated in the past and the process model.SELECTED DRAWING: Figure 1
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