CLAIMS
1. A required quantity calculation device comprising:
a required quantity calculation unit (11) for calculating a required quantity, that is a necessary quantity, of a plurality of parts constituting a product that is manufactured on order and that is constituted of said plurality of parts, each of which is determined by a plurality of specification values, based on said specification value of each item of specifications according to said specifications required by said order;
a configuration information storage unit (32) for storing configuration information that is information indicating a relationship between said specification value and types of said parts and the numbers of said parts that are necessary according to the specification value; and
a predicted value storage unit (42) for storing a predicted value for said specification value determined in advance for each said item of said specifications, wherein
said required quantity calculation unit (11)
calculates, with respect to said item of said specifications for which said specification value is input, said required quantity of said parts based on said specification value while referring to said configuration information, and
calculates, with respect to said item of said specifications for which said specification value is not input, said required quantity of said parts based on said predicted value while referring to said configuration information.
2. The required quantity calculation device according to claim 1, wherein said
required quantity calculation unit

calculates, with respect to said item of said specifications for which said specification value is input, types of said parts and the numbers of said parts based on said specification value while referring to said configuration information, and
calculates, with respect to said item of said specifications for which said specification value is not input, types of said parts and the numbers of said parts based on said predicted value while referring to said configuration information.
3. The required quantity calculation device according to claim 1 or 2, wherein said configuration information is parameterized information of the relationship between said specification value and the types of said parts and the numbers of said parts that are necessary according to the specification value.
4. The required quantity calculation device according to any one of claims 1 to 3, wherein
said predicted value is defined together with a probability of each of a plurality of numerical values being demanded, for each said item of said specifications, and
said required quantity calculation unit (11) calculates, with respect to said item of said specifications for which said specification value is not input, said required quantity based on an expected value of said predicted value while referring to said configuration information.
5. A required quantity calculation method, wherein
a configuration information storage unit (32) stores configuration information that is information indicating a relationship between a specification value of each item of specifications according to said specifications required by an order, the specifications

being of a product that is manufactured on said order and that is constituted of a plurality of parts, each of which is determined by a plurality of specification values, and types of said parts and the numbers of said parts that constitute said product and that are necessary according to the specification value,
a predicted value storage unit (42) stores a predicted value for said specification value determined in advance for each item of said specifications, and
a required quantity calculation unit (11)
calculates, with respect to said item of said specifications for which said specification value is input, said required quantity of said parts based on said specification value while referring to said configuration information, and
calculates, with respect to said item of said specifications for which said specification value is not input, said required quantity of said parts based on said predicted value while referring to said configuration information.
6. The required quantity calculation method according to claim 5, wherein said
required quantity calculation unit (11)
calculates, with respect to said item of said specifications for which said specification value is input, types of said parts and the numbers of said parts based on said specification value while referring to said configuration information, and
calculates, with respect to said item of said specifications for which said specification value is not input, types of said parts and the numbers of said parts based on said predicted value while referring to said configuration information.
7. The required quantity calculation method according to claim 5 or 6, wherein
said configuration information is parameterized information of the relationship between

said specification value and the types of said parts and the numbers of said parts that are necessary according to the specification value.
8. The required quantity calculation method according to any one of claims 5 to 7,
wherein
said predicted value is defined together with a probability of each of a plurality of numerical values being demanded, for each said item of said specifications, and
said required quantity calculation unit (11) calculates, with respect to said item of said specifications for which said specification value is not input, said required quantity based on an expected value of said predicted value while referring to said configuration information.
9. The required quantity calculation method according to any one of claims 5 to 8,
wherein said required quantity calculation unit (11)
calculates, with respect to said item of said specifications for which said specification value is not input, types of said parts and the numbers of said parts based on said predicted value while referring to said configuration information,
creates a calculation target record in which each said specification value of all of said specifications is set,
extracts a top row in a case where the top row in said calculation target record exists, and
calculates said required quantity by acquiring types of said parts and the numbers of said parts in said extracted top row from said configuration information that is parameterized information.