1. A sound processor comprising: a creating module configured to create first and second resonance tube models based on a frequency characteristic that represents an acoustic property of an object to be measured, the first resonance tube model being modeled based on resonance properties of a first resonance peak with respect to a frequency band enclosing a first resonance frequency at the first resonance peak represented as the frequency characteristic, the second resonance tube model being modeled based on resonance properties of a second resonance peak with respect to a frequency band enclosing a high order resonance frequency which is not an integer multiple of the first resonance frequency at the second resonance peak represented as the frequency characteristic; a filter configured to extract frequency component in the frequency band enclosing the first resonance frequency from the first resonance tube model to create a first partial acoustic model, and extract frequency component in the frequency band enclosing the second resonance frequency from the second resonance tube model to create a second partial acoustic model; and a combining module configured to combine the first partial acoustic model and the second partial acoustic model to create an entire acoustic model.