The present invention comprises: an extraction unit 101 that analyzes a document in which information regarding the skills possessed by a worker is recorded in natural language and extracts a skill expression and an operation expression corresponding to the skill expression; a conversion unit 102 that converts the skill expression extracted by the extraction unit 101 and the operation expression corresponding to the skill expression into a skill name and a skill evaluation value; a similarity calculation unit 103 that calculates the similarity between the skill name and the skill evaluation value obtained as a result of conversion by the conversion unit 102 and a skill name and a required skill value required of a worker in charge of a task; and a proposal unit 104 that uses the similarity calculated by the similarity calculation unit 103 as a basis to propose a worker to take charge of a task or a task of which the worker is to be in charge. When the degree of difficulty involved in carrying out the operation expression corresponding to the skill expression extracted by the extraction unit 101 is high, the conversion unit 102 converts to a higher skill value than when the difficulty involved in carrying out the operation expression corresponding to the skill expression is low.