Management device, management method, and computer program

Abstract

This management device 100 comprises an information acquisition unit that acquires information pertaining to the state or amount of building materials recovered from a building.

Description

Management device, management method, and computer program

[0001] The present disclosure relates to a management device, a management method, and a computer program for managing the recycling of resources from building materials removed from buildings during demolition or renovation of buildings.

[0002] As a countermeasure for environmental issues such as global warming, frameworks for reusing resources have been established. For example, resources recycled from collected waste paper, PET bottles, cans, bottles and the like are reused in products (see, for example, Patent Document 1).

[0003] Japanese Patent Application Laid-Open No. 2010-184498

[0004] When demolishing or renovating building materials, facilities and the like installed in buildings such as houses, existing building materials and facilities are removed and discarded. A framework for promoting the recycling of such removed materials is needed.

[0005] The present disclosure has been made in view of such problems, and an object thereof is to provide a technique for promoting resource recycling.

[0006] In order to solve the above problems, a management device according to one aspect of the present disclosure includes an information acquisition unit that acquires information related to the state or amount of building materials collected from a building.

[0007] Another aspect of the present disclosure is a management method. This method causes a computer to execute a step of acquiring information related to the state or amount of building materials collected from a building.

[0008] Any combination of the above components, and conversions of the expressions of the present disclosure between methods, devices, systems, recording media, computer programs, and the like are also effective as aspects of the present disclosure.

[0009] This figure shows the configuration of the management system according to the embodiment of this disclosure. This figure schematically shows the flow of building material recycling according to the embodiment of this disclosure. This figure shows the procedure for the building material recycling method according to the embodiment of this disclosure. This figure shows the configuration of the management device according to the embodiment. This figure shows an example of internal data in the building material information database. This figure shows an example of internal data in the waste material database. This figure shows an example of internal data in the billet database. This figure shows an example of internal data in the building material database.

[0010] This invention describes a technology that promotes the recycling of resources contained in building materials removed from buildings such as houses when they are demolished or renovated. In this embodiment, the example of recycling aluminum is mainly described, but the technology in this embodiment can also be applied to recycling other resources such as resins.

[0011] Virgin materials of pure aluminum and aluminum alloys are mainly aluminum oxide (Al ２ O ３ Aluminum is manufactured using bauxite, which is mainly composed of alumina, as a raw material, but this process consumes a large amount of electricity. On the other hand, when recycling pure aluminum or aluminum alloys, electrolytic reduction is not necessary, so the energy consumption is only about 3-5% of that when manufacturing virgin materials. Therefore, recycling aluminum can significantly reduce energy consumption and carbon dioxide emissions.

[0012] Figure 1 shows the configuration of a management system according to an embodiment of the present disclosure. The management system 1 comprises a construction company terminal 10, a demolition company terminal 20, a recycling company terminal 40, a recycling company terminal 50, a manufacturer terminal 60, a management device 100, and a communication network 9 connecting these components.

[0013] The control device 100 manages the process for recycling aluminum. The construction contractor terminal 10 is a terminal device used by construction contractors who build buildings. The demolition contractor terminal 20 is a terminal device used by demolition contractors who demolish part or all of a building. The recycling contractor terminal 40 is a terminal device used by recycling contractors who collect building materials removed from buildings during demolition or renovation. The recycling contractor terminal 50 is a terminal device used by recycling contractors who recycle resources such as aluminum contained in the removed building materials. The manufacturer terminal 60 is a terminal device used by manufacturers who manufacture building materials.

[0014] Figure 2 schematically shows the flow of building material recycling according to an embodiment of this disclosure. Figure 3 shows the procedure of the building material recycling method according to an embodiment of this disclosure. In the following description, there may be no particular distinction between entities such as construction companies, demolition companies, collection companies, recycling companies, and manufacturers, and terminal devices used by those entities. That is, an action described with the entity as the subject may be performed by the terminal device, and an action described with the terminal device as the subject may be performed by the entity.

[0015] When buildings 2a and 2b are constructed, construction companies 11a and 11b, such as house builders, install building materials such as aluminum-containing sashes into buildings 2a and 2b (S10).

[0016] When buildings 2a and 2b are demolished or renovated, demolition contractors 21a and 21b remove building materials 3a and 3b containing aluminum that were installed in buildings 2a and 2b (S12). Demolition contractors 21a and 21b transmit information about the removed building materials 3a and 3b to the management device 100 (S14).

[0017] Information regarding building material 3 may include identification information such as the product number of building material 3, type, size, quality, color, condition, usage period, quantity, presence or absence of attached parts, type, number, condition, and content of heavy metals such as lead. The types of attached parts may include glass, stoppers, rollers, stays, crescent locks, handles, anti-sway devices to prevent rattling between the sliding door and the frame, glazing channels, etc.

[0018] Information regarding building material 3 may include the type of aluminum alloy contained in building material 3. The type of aluminum alloy may be represented by an alloy number specified in the Japanese Industrial Standards (JIS). By adding various elements to aluminum, alloys with various mechanical, physical, and chemical properties can be formed. Depending on the type and application of building material 3, an appropriate type of aluminum alloy is used. For example, pure aluminum with an alloy number in the 1000s has excellent workability, corrosion resistance, electrical conductivity, and thermal conductivity, but low strength. Alloys with magnesium and silicon with an alloy number in the 6000s have excellent strength and corrosion resistance, and aluminum alloy with alloy number 6063 in particular is used in building sashes, etc.

[0019] Information regarding building material 3 may be obtained by reading a two-dimensional code or RF tag attached to or embedded in building material 3. In this case, the demolition contractor 21 reads the two-dimensional code or RF tag with the demolition contractor terminal 20 to obtain information regarding building material 3 and transmits the obtained information to the management device 100. Information regarding building material 3 may also be obtained by referring to a building material information database that stores information regarding building materials, based on identification information such as the product number of building material 3.

[0020] Information regarding building material 3 may be obtained by analyzing captured images of building material 3. In this case, information regarding building material 3 may be obtained using a classifier that takes captured images of building material 3 as input and outputs information regarding building material 3. The classifier may be artificial intelligence constructed using a neural network or the like. The classifier may be trained using combinations of captured images of building material 3 and information regarding building material 3 as training data. The classifier may be trained by adjusting the weights of the intermediate layers so that when captured images of building material 3 are input to the input layer of the neural network, information regarding building material 3 is output from the output layer. In the case of building material 3 made of aluminum alloy, the characteristics of aluminum alloy often appear in the cross-sectional shape, surface properties, color, and texture, so information regarding building material 3 may be obtained by analyzing captured images of the cross-section of building material 3.

[0021] The analysis of the captured images may be performed by the terminal device of the demolition contractor 21, or by the management device 100. In the former case, the demolition contractor 21 captures images of the building materials 3 using the demolition contractor terminal 20. The demolition contractor terminal 20 analyzes the captured images of the building materials 3 to obtain information about the building materials 3 and transmits the obtained information to the management device 100. In the latter case, the demolition contractor 21 captures images of the building materials 3 using the demolition contractor terminal 20 and transmits them to the management device 100. The management device 100 analyzes the captured images of the building materials 3 obtained from the demolition contractor 21 to obtain information about the building materials 3.

[0022] Based on information regarding the building materials 3, the management device 100 estimates the price that the recycling company 51 will pay when taking possession of the building materials 3 and presents this estimate to the construction company 11 or demolition company 21 (S16). The management device 100 calculates the purchase price of the building materials 3 based on the type, weight, quality, and transaction price of the aluminum alloy contained in the building materials 3, the quantity of building materials 3, the presence, type, and quantity of parts attached to the building materials 3, the costs required for removing and separating the parts, and the type, weight, quality, and transaction price of the aluminum alloy expected to be recycled from the building materials 3. If the building materials 3 are delivered to the recycling company 51 with parts attached to the sash, the management device 100 may estimate a lower purchase price for the building materials 3 than if the building materials 3 were delivered to the recycling company 51 without parts attached to the sash, as this process requires removing and separating the parts. If the building material 3 is handed over to the recycling company 51 with the glass still attached to the sash, there is a risk of the glass breaking during transportation of the sash or when removing and separating the glass from the sash. Therefore, the management device 100 may estimate a lower purchase price for the building material 3 than if it were handed over to the recycling company 51 without the glass attached to the sash. If the recycling company 51 outsources the work of removing and separating parts such as glass from the sash to another company, the management device 100 may estimate the transaction price of the building material 3 after deducting the outsourcing costs.

[0023] Conventionally, if a demolition company 21 lacked specialized knowledge regarding aluminum alloys, building materials containing aluminum alloys were often disposed of as mixed waste. However, according to the technology of this embodiment, the management device 100 identifies building materials 3 containing aluminum alloys and presents the purchase price for the recycling company 51 when it takes possession of the building materials 3. As a result, even a demolition company 21 without specialized knowledge regarding aluminum alloys can hand over valuable building materials 3 containing aluminum alloys to the recycling company 51 for effective recycling. This significantly promotes aluminum recycling.

[0024] The construction company 11 or demolition company 21 selects the building materials 3 to be handed over to the recycling company 51 by referring to the estimate provided by the management device 100, and has the collection company 41 collect them. The collection company 41 transports the building materials 3 collected from the demolition site in an appropriate manner depending on whether or not there is glass, etc., and hands them over to the recycling company 51 (S18). At this time, the recycling company 51 measures the weight of the collected building materials 3 (S20), transmits the weight of the collected building materials 3 to the management device 100 (S22), and automatically issues a slip of paper with the weight of the collected building materials 3 written on it using the collection company terminal 40 and hands it over to the collection company 41 (S24). The recycling company 51 may also measure the weight of the truck loaded with the building materials 3 and the weight of the truck that unloaded the building materials 3 using a weighbridge, and use the difference between them as the weight of the collected building materials 3.

[0025] Based on information regarding the building materials 3, the management device 100 determines the aluminum recycling process to be carried out by the recycling company 51 and manages the progress of the process (S28). The recycling company 51 recycles aluminum alloy from the recovered building materials 3 according to the process determined by the management device 100 and manufactures aluminum alloy billets 4 (S26). A billet is a primary processed metal product for extrusion processing, and cylindrical or rectangular prism-shaped billets are used. Based on information such as the presence, type, number, and condition of the attached parts of the building materials 3, the management device 100 determines whether a process to separate the attached parts from the building materials 3 is necessary, the construction period, the person in charge of the work, the work location, the subcontractor, etc., and presents this information to the recycling company 51.

[0026] The recycling company 51 may manufacture billets 4 using multiple building materials 3 containing the same type of aluminum alloy, based on the alloy number of the aluminum alloy contained in the recovered building materials 3. The recycling company 51 may also manufacture billets 4 by mixing multiple building materials 3, each containing several types of aluminum alloy. For example, a billet 4 of aluminum alloy 6063 containing magnesium and silicon may be manufactured by mixing building materials 3 containing pure aluminum in the 1000 series, aluminum alloy in the 3000 series containing manganese, aluminum alloy in the 4000 series containing silicon, and aluminum alloy in the 6000 series containing magnesium and silicon in an appropriate mixing ratio. The control device 100 selects the building materials 3 to be used in the manufacture of billets 4 based on information such as the alloy number, amount recovered, quality, and condition of the aluminum alloy contained in the building materials 3, and presents them to the recycling company 51.

[0027] The recycling company 51 transmits information such as the identification information of the manufactured billet 4, the identification information and quantity of the building material 3 used in the manufacture of the billet 4, the amount of aluminum alloy contained in the building material 3, and the identification information of the construction company 11 that built the building 2 on which the building material 3 was installed to the management device 100 (S30).

[0028] The control device 100 determines the manufacturing process of the building material 5 by the manufacturer and manages the progress of the process (S32). The manufacturer 61 extrudes the billet 4 using an extrusion molding machine according to the process determined by the control device 100, and manufactures the building material 5 through processing processes such as surface treatment, cutting, notching, and drilling (S34). Based on information such as the specifications required for the building material 5, the ratio of recycled aluminum alloy to be included in the building material 5, the alloy number and amount of recycled aluminum alloy included in the billet 4, the amount of elements other than aluminum, and the quality of the billet 4, the control device 100 determines the billet 4 and virgin material to be used in the manufacture of the building material 5 and presents this to the manufacturer 61.

[0029] The manufacturer 61 transmits information such as the identification information of the building material 5, the identification information of the billet 4 and virgin material used in the manufacture of the building material 5, and the quantity to the management device 100 (S36).

[0030] The manufactured building materials 5 are delivered to construction companies 11a and 11b and installed in buildings 2c and 2d (S38). The manufacturer 61 transmits information such as identification information and quantity of the building materials 5 to be delivered to construction company 11 to the management device 100 (S40).

[0031] The management device 100 calculates and presents an indicator related to aluminum recycling for each construction company 11 at any time (S42). The indicator may include the balance of aluminum usage and recovery by the construction company 11, aggregated over a predetermined period. The indicator may also include the balance of aluminum usage and recycling by the construction company 11, aggregated over a predetermined period. The indicator may also include the proportion of recycled resources in the building materials used in buildings constructed by the construction company 11. This allows construction companies to publicly demonstrate, with reliable data, that they are actively engaged in aluminum recycling and achieving positive results, thereby motivating them to further collect aluminum waste and significantly promoting aluminum recycling.

[0032] The indicator may include the recycling rate of aluminum alloy recycled from waste materials. The recycling rate may be the ratio of the amount of aluminum alloy recovered from building materials recovered from buildings to the amount of aluminum alloy recycled from building materials recovered from buildings. The amount of aluminum alloy recovered may be the amount before parts are separated at the time the waste materials are recovered, or it may be the amount at the time when parts are separated and fed into the melting furnace. The amount of aluminum alloy recovered or recycled may be expressed in terms of the weight of the recovered or recycled aluminum alloy. This recycling rate may be used by the management device 100 when managing the aluminum recycling process by the recycling company 51.

[0033] The collection company 41, the recycling company 51, and the manufacturer 61 may each be different businesses, or any two or all of them may be the same business. Also, the construction company 11, the demolition company 21, and the collection company 41 may each be different businesses, or any two or all of them may be the same business. The management device 100 may be operated by any of the construction company 11, the demolition company 21, the collection company 41, the recycling company 51, and the manufacturer 61, or it may be operated by a third party.

[0034] Figure 4 shows the configuration of a management device according to an embodiment. The management device 100 includes a communication device 101, a display device 102, an input device 103, a processing device 120, and a storage device 150. The management device 100 may be a server device, a device such as a personal computer, or a mobile terminal such as a mobile phone terminal, smartphone, or tablet terminal.

[0035] The communication device 101 controls communication with other devices via a communication network such as a wireless LAN or the Internet. The communication device 101 may communicate using any wired or wireless communication method. The display device 102 displays a screen generated by the processing device 120. The display device 102 may be a liquid crystal display device, an organic EL display device, or the like. The input device 103 transmits instructions from the user or administrator of the management device 100 to the processing device 120. The input device 103 may be a mouse, keyboard, touchpad, or the like. The display device 102 and the input device 103 may be implemented as a touch panel.

[0036] The storage device 150 stores programs, data, etc., used by the processing device 120. The storage device 150 may be a semiconductor memory, a hard disk, or the like. The storage device 150 includes a building materials information database 151, a waste material database 152, a billet database 153, and a building materials database 154.

[0037] The building materials information database 151 stores information about building materials. Figure 5 shows an example of the internal data of the building materials information database 151. The building materials information database 151 stores information such as the product number, type, size, weight, price of the building material, the alloy number of the aluminum alloy contained in the building material, and the aluminum alloy content contained in the building material.

[0038] The waste material database 152 stores information about the waste materials handed over to the recycling company 51. Figure 6 shows an example of the internal data of the waste material database 152. The waste material database 152 stores information such as the identification information of the waste material, the identification information of the construction company that built the building in which the waste material was used, the type, quality, and condition of the waste material, the period during which the waste material was used as building material in the building, and information about the parts attached to the waste material.

[0039] The billet database 153 stores information about billets manufactured by the recycling company 51. Figure 7 shows an example of the internal data of the billet database 153. The billet database 153 stores information such as billet identification information, identification information of the waste materials used in the manufacture of the billet, billet size, weight, price, and alloy number of the aluminum alloy contained in the billet.

[0040] The building materials database 154 stores information about building materials manufactured by the manufacturer 61. Figure 8 shows an example of the internal data of the building materials database 154. The building materials database 154 stores information such as building material identification information, billet identification information used in the manufacture of the building materials, virgin material identification information used in the manufacture of the building materials, type of building material, weight, recycled aluminum alloy content, and identification information of the construction company to which the building materials are delivered.

[0041] The processing device 120 includes an information acquisition unit 121, an identification unit 122, a collection price estimation unit 123, a recycling process management unit 124, a manufacturing process management unit 125, and an indicator presentation unit 126. In terms of hardware, these components are implemented by any circuit, a CPU of a computer, a memory, other LSIs, and the like, and in terms of software, they are implemented by a program loaded into a memory, etc. However, functional blocks implemented by cooperation of these components are illustrated here. Therefore, it should be understood by those skilled in the art that these functional blocks can be implemented in various forms, such as by only hardware or a combination of hardware and software.

[0042] In step S14, the information acquisition unit 121 acquires information about building materials removed from a building from a dismantler terminal 20 and stores the information in a waste material database 152. In step S30, the information acquisition unit 121 acquires information about billets manufactured by a recycler 51 from a recycler terminal 50 and stores the information in a billet database 153. In step S36, the information acquisition unit 121 acquires information about building materials manufactured by a manufacturer 61 from a manufacturer terminal 60 and stores the information in a building material database 154. In step S40, the information acquisition unit 121 acquires information about building materials delivered from the manufacturer 61 to a constructor 11 and stores the information in the building material database 154.

[0043] The identification unit 122 analyzes a captured image of a building material acquired from the dismantler terminal 20 to identify the building material. The identification unit 122 may identify a building material from a captured image of the building material by using a trained classifier.

[0044] In step S16, the collection price estimation unit 123 estimates a consideration for the recycler to collect the building material based on the information about the building material, and presents the estimated consideration to a constructor terminal 10 or the dismantler terminal 20.

[0045] In step S24, a slip issuing unit 127 acquires the weight of the building material delivered by a collector 41 to the recycler 51 from a weighbridge, and automatically issues a slip describing the weight of the building material.

[0046] In S28, the recycling process management unit 124 determines the aluminum recycling process by the recycling company 51 based on the information stored in the waste material database 152, and manages the progress of the process. The recycling process management unit 124 determines whether a process for separating accessory parts from building materials is necessary, the construction period, the person in charge of the work, the work location, and the outsourcing contractor, and presents the information to the recycling company terminal 50. The recycling process management unit 124 selects building materials to be used for billet production based on information such as the alloy number, recovered amount, quality, and condition of the aluminum alloy included in the building materials, and presents the selected building materials to the recycling company terminal 50.

[0047] In S32, the manufacturing process management unit 125 determines the building material manufacturing process by the manufacturer 61, and manages the progress of the process. The manufacturing process management unit 125 determines billets and virgin materials to be used for manufacturing building materials based on information such as specifications required for building materials, the ratio of recycled aluminum alloy that should be included in building materials, the alloy number and amount of recycled aluminum alloy included in billets, the amount of elements other than aluminum, and the quality of billets, and presents the determined result to the manufacturer terminal 60.

[0048] In S42, the indicator presentation unit 126 calculates and presents indicators related to aluminum recycling for each construction company 11. The indicator presentation unit 126 may present to the construction company terminal 10 the balance of aluminum usage and recovery amount by the construction company 11 aggregated over a predetermined period. The indicator presentation unit 126 may present to the construction company terminal 10 the balance of aluminum usage and recycling amount by the construction company 11 aggregated over a predetermined period. The indicator presentation unit 126 may present to the construction company terminal 10 the proportion of recycled resources in the resources included in the building materials used for the building constructed by the construction company 11. The indicator presentation unit 126 may present to the recycling company terminal 50 the recycling rate of aluminum alloy recycled from waste materials.

[0049] The present disclosure has been described above based on the embodiments. However, the embodiments merely illustrate the principle and application of the present disclosure. In addition, many modifications and arrangement changes can be made to the embodiments within the scope that does not deviate from the idea of the present disclosure defined in the claims.

[0050] While the embodiments described primarily focus on the recycling of aluminum contained in building materials, the technology of this disclosure can also be used to promote the recycling of resources contained in equipment, machinery, furniture, and other components installed in buildings.

[0051] This disclosure can be used in a management device, a management method, and a computer program for managing the recycling of resources from building materials removed from buildings during demolition or renovation.

[0052] 1...Management system, 2...Buildings, 3...Building materials, 4...Billet, 5...Building materials, 9...Communication network, 10...Construction company terminal, 11...Construction company, 20...Demolition company terminal, 21...Demolition company, 40...Collection company terminal, 41...Collection company, 50...Recycling company terminal, 51...Recycling company, 60...Manufacturer terminal, 61...Manufacturer, 100...Management device, 101...Communication device, 102...Display device, 103...Input device, 120...Processing device, 121...Information acquisition unit, 122...Identification unit, 123...Collection price estimation unit, 124...Recycling process management unit, 125...Manufacturing process management unit, 126...Indicator presentation unit, 127...Slip issuance unit, 150...Storage device, 151...Building material information database, 152...Waste material database, 153...Billet database, 154...Building material database.

Claims

1. A management device equipped with an information acquisition unit that acquires information regarding the condition or quantity of building materials recovered from a building.

2. The management device according to claim 1, comprising: an information acquisition unit that acquires information representing the amount of resources contained in building materials used in a building constructed by a building entity and the amount of resources contained in building materials recovered from a building constructed by the building entity; and an indicator presentation unit that calculates and presents an indicator for resource recycling for each building entity based on the information acquired by the information acquisition unit.

3. The management device according to claim 2, wherein the indicator includes a balance representing the amount of resources used and recovered by the construction entity, aggregated over a predetermined period.

4. The management device according to claim 2 or 3, wherein the information acquisition unit acquires information representing the amount of resources recycled using building materials recovered from buildings constructed by the construction entity, and the indicator includes a balance representing the amount of resources used and recycled by the construction entity, aggregated over a predetermined period.

5. The management device according to any one of claims 2 to 4, wherein the indicator includes the proportion of recycled resources in the resources contained in the building materials used in the building constructed by the construction entity.

6. The management device according to any one of claims 2 to 5, wherein the indicator includes the ratio of the amount of resources contained in the building materials recovered from the building to the amount of resources recycled from the building materials recovered from the building.

7. The management device according to claim 1, comprising: an information acquisition unit that acquires information indicating whether or not parts are attached to building materials recovered from a building; and a regeneration process management unit that manages the process of regenerating the building materials based on the information acquired by the information acquisition unit.

8. The management device according to claim 7, wherein the regeneration process management unit manages the process of separating the parts from the building material based on information indicating whether or not the parts are attached, the type, number, or condition of the parts.

9. The control device according to claim 7 or 8, wherein the building material is a sash, and the component includes a component made of glass or resin.

10. The control device according to any one of claims 7 to 9, wherein the recycling process control unit determines the building materials to be used for manufacturing billets based on the types of aluminum alloys contained in the recovered building materials.

11. The management device according to any one of claims 7 to 10, further comprising a purchase price estimation unit that estimates the purchase price when a recycling entity takes possession of the building materials based on information relating to the building materials.

12. The management device according to claim 11, wherein the pickup price estimation unit estimates the pickup price of building materials with the parts attached to be lower than the pickup price of building materials without the parts.

13. A management device according to any one of claims 7 to 12, comprising an identification unit that identifies the building material based on an image of the building material and acquires information relating to the building material.

14. A control method that causes a computer to perform the step of obtaining information regarding the condition or quantity of building materials recovered from a building.

15. The management method according to claim 14, wherein the step of acquiring the information includes acquiring information representing the amount of resources contained in building materials used in a building constructed by the building constructor and the amount of resources contained in building materials recovered from a building constructed by the building constructor, and the computer is made to perform the step of calculating and presenting an index for resource recycling for each building constructor based on the acquired information.

16. The management method according to claim 14, wherein the step of acquiring the information includes acquiring information representing the amount of resources contained in building materials used in a building constructed by the building constructor and the amount of resources contained in building materials recovered from a building constructed by the building constructor, and the computer is made to perform the step of calculating and presenting an index for resource recycling for each building constructor based on the acquired information.

17. A computer program that causes a computer to function as an information acquisition unit that acquires information regarding the condition or quantity of building materials recovered from a building.

18. The computer program according to claim 17, wherein the information acquisition unit acquires information representing the amount of resources contained in building materials used in a building constructed by the building entity and the amount of resources contained in building materials recovered from a building constructed by the building entity, and causes the computer to function as an indicator presentation unit that calculates and presents an indicator for resource recycling for each building entity based on the information acquired by the information acquisition unit.

19. The computer program according to claim 17, wherein the information acquisition unit acquires information representing the amount of resources contained in building materials used in a building constructed by the building entity and the amount of resources contained in building materials recovered from a building constructed by the building entity, and causes the computer to function as an indicator presentation unit that calculates and presents an indicator for resource recycling for each building entity based on the information acquired by the information acquisition unit.

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