ROAD CONDITION ESTIMATION APPARATUS, METHOD AND PROGRAM

A road condition estimation device includes: a reception unit that receives pieces of sensor information from automobiles respectively, each piece of sensor information including positional information that is information regarding a position at which an automobile travels, and spectral information obtained by converting an acoustic signal generated when the automobile travels at the position into information in a frequency domain; a first classification unit that classifies the pieces of spectral information respectively for roads on which the automobiles travel, based on pieces of positional information included in the pieces of sensor information thus received; and an estimation unit that estimates a condition of a road for each of the pieces of spectral information classified by the first classification unit.