Patent Publication Number: US-2022228714-A1

Title: Hydrogen gas supply system, point management system, and service management system

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     The present application claims the priority based on Japanese Patent Application No. 2018-214545 filed on Nov. 15, 2018, the disclosure of which is hereby incorporated by reference in its entirety. 
     BACKGROUND 
     Field 
     The present disclosure relates to a hydrogen gas supply system, a point management system, and a service management system. 
     Related Art 
     Hydrogen stations that supply hydrogen gas to users have been available. For example, in the technology in JP 2016-223589A, an operator attaches a filling nozzle to a fuel tank mounted on a vehicle, and then enters a filling start instruction on an input portion. Due to differential pressure between an accumulator and the fuel tank, the fuel tank is then filled, via a hydrogen gas supply pipe, a filling hose, and the filling nozzle, with high-pressure hydrogen gas stored in the accumulator in a hydrogen station. When an output of a gas flowmeter provided to the hydrogen gas supply pipe is equal to or below a predetermined value, filling of hydrogen gas to the fuel tank ends. 
     A hydrogen station stores hydrogen gas manufactured through various methods. Various methods as described below, for example, are available for manufacturing hydrogen. (1) A first method obtains hydrogen by allowing fossil fuel and water vapor to react with each other. (2) A second method obtains hydrogen by allowing hydrocarbon obtained from biomass and water vapor to react with each other. (3) A third method obtains hydrogen as a by-product in iron mills and chemical factories. (4) A fourth method obtains hydrogen by allowing water to undergo electrolysis with electric power obtained by utilizing solar light and wind power. 
     With the first method, a large amount of hydrogen can be stably manufactured. Furthermore, with the first method, hydrogen can be cost-effectively manufactured. Carbon dioxide and nitrogen oxide are however generated in the process of manufacturing hydrogen. With the second method and the third method, an amount of obtained hydrogen may vary depending on biomass or an amount of how much a main product is generated in an iron mill or a chemical factory. Furthermore, with the second method and the third method, carbon dioxide is generated. With the fourth method, no carbon dioxide is generated. With the fourth method, however, an amount of hydrogen varies depending on natural phenomena such as weather conditions, preventing hydrogen from being stably supplied. Furthermore, with the fourth method, currently, a cost of producing hydrogen is higher, compared with the first to third methods. 
     In the technology described in JP 2016-223589A, a user of a vehicle is not notified with information on a method for manufacturing hydrogen gas stored in a hydrogen station. This prevents, from selecting and purchasing hydrogen, the user to be supplied with hydrogen, who is willing to purchase such hydrogen that is higher in cost but lower in an environmental burden. For example, a user is not able to make a selection of a hydrogen station providing hydrogen manufactured with less environmental burdens or a hydrogen station providing hydrogen manufactured with more environmental burdens. In a case where a hydrogen station is supplied with hydrogen from a plurality of supply sources where methods for manufacturing hydrogen differ from each other, and stores such hydrogen gas, a user is not able to make at all a selection of one of the methods for manufacturing hydrogen. 
     SUMMARY 
     The present disclosure can be implemented in aspects described below. 
     According to an aspect of the present disclosure, a hydrogen gas supply system that supplies hydrogen gas to a user is provided. The hydrogen gas supply system comprises a storing unit that stores hydrogen, a communication unit that receives at least either of burden information indicative of an environmental burden exerted during manufacturing of hydrogen externally received by the storing unit and quality information indicative of quality with respect to the hydrogen externally received by the storing unit, a user interface unit that provides an output in accordance with the at least either of the burden information and the quality information with respect to the hydrogen supplied from the storing unit to the user, and a controller that controls the user interface unit based on an amount of the hydrogen received by the storing unit and the at least either of the burden information and the quality information, which is received by the communication unit. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an explanatory diagram of a hydrogen management system  1  according to a present embodiment. 
         FIG. 2  is a diagram of display on a display panel  270  of a hydrogen gas supply facility  200 A. 
         FIG. 3  is a diagram of display on the display panel  270  of the hydrogen gas supply facility  200 A. 
         FIG. 4  is a front view of a hydrogen vehicle  400 . 
         FIG. 5  is a plan view of a pay parking lot P 0  provided adjacent to a facility. 
     
    
    
     DETAILED DESCRIPTION 
     A. Embodiment 
     A1. Configuration of Hydrogen Supply System 
       FIG. 1  is an explanatory diagram of a hydrogen management system  1  according to the present embodiment. The hydrogen management system  1  includes a point management server  100 , hydrogen gas supply facilities  200 A and  200 B, a service management device  300 , hydrogen generation facilities  500 A and  500 B, and hydrogen gas delivery vehicles  600 A and  600 B. 
     The hydrogen gas supply facility  200 A is a store that supplies hydrogen gas to users. The hydrogen gas supply facility  200 A is, in the present embodiment, a so-called hydrogen station that supplies hydrogen gas to a hydrogen vehicle  400 . The hydrogen gas supply facility  200 A includes a hydrogen gas storing unit  204 , a hydrogen gas supply device  209 , a control device  250 , communication interfaces  262 ,  264 , and  266 , and a display panel  270 . 
     The hydrogen gas storing unit  204  is a tank that stores hydrogen gas. The hydrogen gas storing unit  204  can store hydrogen gas at a maximum amount of 300 liters under a pressure of approximately 82 MPa. 
     The hydrogen gas supply device  209  can supply hydrogen gas in the hydrogen gas storing unit  204  to outside of the hydrogen gas supply facility  200 . A target to which the hydrogen gas supply device  209  supplies hydrogen gas is, specifically, the hydrogen vehicle  400 . 
     The control device  250  controls components of the hydrogen gas supply facility  200 A. The control device  250  includes a central processing unit (CPU)  251  serving as a processor, a random access memory (RAM)  252 , and a read-only memory (ROM)  253 . The control device  250  is installed with a control program that controls the components of the hydrogen gas supply facility  200 A. In the control device  250 , the CPU  251 , the RAM  252 , and the ROM  253  serving as hardware resources and the control program cooperate with each other. Specifically, the CPU  251  loads the computer program stored in the ROM  253  into the RAM  252  and executes the computer program to achieve various functions. The RAM  252  stores information obtained or generated by the CPU  251 . 
     The CPU  251  controls the display panel  270  based on, for example, an amount of hydrogen received by the hydrogen gas storing unit  204  and burden information Ii and quality information Iq received by the communication interface  262 . The burden information Ii and the quality information Iq will be described later. The CPU  251  exchanges various kinds of information with a device outside of the hydrogen gas supply facility  200 A, and stores in the RAM  252  the obtained information or information generated from the obtained information.  FIG. 1  illustrates, as  262 ,  264 , and  266 , the communication interfaces each allowing the control device  250  to exchange various kinds of information with a device outside of the hydrogen gas supply facility  200 A. Information to be exchanged via the communication interfaces will be described later. 
     The display panel  270  includes a display provided with a touch panel, as well as includes a speaker. The display panel  270  outputs information stored by the control device  250  to a user of the hydrogen gas supply facility  200 A. The display panel  270  further delivers information input externally to the control device  250 . 
     For example, the display panel  270  is controlled by the control device  250  to output the burden information Ii and the quality information Iq with respect to hydrogen to be supplied from the hydrogen gas storing unit  204  to the user. By performing such processing as described above, the user can utilize information generated based on information on an environmental burden exerted during manufacturing and quality, which is output from the display panel  270 , to determine whether to accept supply of hydrogen stored in the hydrogen gas storing unit  204 . 
     The hydrogen generation facility  500 A allows fossil fuel and water to react with each other to generate hydrogen. More specifically, the hydrogen generation facility  500 A allows methane and water vapor to react with each other to generate hydrogen and carbon monoxide. The hydrogen generation facility  500 A further allows the carbon monoxide and water vapor to react with each other to generate hydrogen and carbon dioxide. The generated hydrogen is compressed and liquefied. The hydrogen generation facility  500 A includes a liquid hydrogen storing unit  504 A. The liquid hydrogen storing unit  504 A is a tank that stores hydrogen generated and liquefied by the hydrogen generation facility  500 A. 
     The hydrogen gas delivery vehicle  600 A receives liquid hydrogen from the liquid hydrogen storing unit  504 A of the hydrogen generation facility  500 A and delivers the liquid hydrogen to the hydrogen gas supply facility  200 . The hydrogen gas delivery vehicle  600 A includes a controller  650 . 
     The controller  650  includes a CPU  651  serving as a processor, a RAM  652 , and a ROM  653 . The CPU  651  controls components of the hydrogen gas delivery vehicle  600 A. The CPU  651  exchanges various kinds of information with a device outside of the hydrogen gas delivery vehicle  600 A, and stores in the RAM  652  the obtained information or information generated from the obtained information. 
     The hydrogen generation facility  500 B generates hydrogen by allowing water to undergo electrolysis with electric power obtained by utilizing natural energy. The hydrogen generation facility  500 B includes a single crystal silicon solar battery. With the single crystal silicon solar battery irradiated with solar light, the hydrogen generation facility  500 B generates electric power. The hydrogen generation facility  500 B generates hydrogen by allowing water to undergo electrolysis with the generated electric power. The generated hydrogen is compressed and liquefied. The hydrogen generation facility  500 B includes a liquid hydrogen storing unit  504 B. The liquid hydrogen storing unit  504 B is a tank that stores hydrogen generated and liquefied by the hydrogen generation facility  500 B. 
     A cost of generating hydrogen in the hydrogen generation facility  500 B is higher than a cost of generating hydrogen identically in amount in the hydrogen generation facility  500 A. On the other hand, environmental burdens exerted when hydrogen is generated in the hydrogen generation facility  500 B are smaller than environmental burdens exerted when hydrogen is generated identically in amount in the hydrogen generation facility  500 A. Environmental burdens can be assessed based on an amount of carbon dioxide generated and an amount of electric power consumed when a unit amount of hydrogen is produced. 
     The hydrogen gas delivery vehicle  600 B receives liquid hydrogen from the liquid hydrogen storing unit  504 B of the hydrogen generation facility  500 B and delivers the liquid hydrogen to the hydrogen gas supply facility  200 . The hydrogen gas delivery vehicle  600 B is identical in configuration and function to the hydrogen gas delivery vehicle  600 A. 
     The hydrogen gas supply facility  200 B is a store that supplies hydrogen to users. The hydrogen gas supply facility  200 B is identical in configuration and function to the hydrogen gas supply facility  200 A. However, a distance from the hydrogen gas supply facility  200 B to a nearest hydrogen generation facility that utilizes natural energy to generate hydrogen is three or more times of a distance from the hydrogen gas supply facility  200 A to the hydrogen generation facility  500 B that utilizes natural energy to generate hydrogen. In the present designation, the hydrogen gas supply facilities  200 A and  200 B will each be simply referred to as a hydrogen gas supply facility  200  unless otherwise required to be separately described. 
     The service management device  300  is a device that manages service contents to be provided to users. In the present embodiment, the service management device  300  is provided in a pay parking lot to manage services of the pay parking lot. More specifically, the service management device  300  controls a lock plate  310  provided at each of parking spaces in the pay parking lot to calculate a charge for use of the each of the parking spaces. The service management device  300  includes a controller  350 , communication interfaces  362  and  364 , and a display panel  370 . 
     The controller  350  controls devices in the pay parking lot including the service management device  300 . The controller  350  includes a CPU  351  serving as a processor, a RAM  352 , and a ROM  353 . The controller  350  is installed with a control program that controls the devices in the pay parking lot including the service management device  300 . In the controller  350 , the CPU  351 , the RAM  352 , and the ROM  353  serving as hardware resources and the control program cooperate with each other. Specifically, the CPU  351  loads the computer program stored in the ROM  353  into the RAM  352  and executes the computer program to achieve various functions. The RAM  352  stores information obtained or generated by the CPU  351 . 
     For example, the CPU  351  exchanges various kinds of information with a device outside of the service management device  300 , and stores in the RAM  352  the obtained information or information generated from the obtained information. The communication interfaces each allowing the controller  350  to exchange various kinds of information with a device outside of the service management device  300  are respectively illustrated as  362  and  364 . 
     The display panel  370  includes a display provided with a touch panel, as well as includes a speaker. The display panel  370  outputs information stored by the controller  350  to a user utilizing the services. The display panel  370  delivers information input externally to the controller  350 . 
     The lock plate  310  is a plate provided at each of the parking spaces in the pay parking lot, and is configured to changing its posture with respect to a plane into which a vehicle is to be parked. The lock plate  310  is controlled by the service management device  300  to take either of a lock state and an unlock state. In the lock state, the lock plate  310  is tilted at a predetermined angle relative to the plane into which a vehicle is to be parked. In the unlock state, the lock plate  310  abuts, i.e., is substantially parallel to, the plane into which a vehicle is to be parked. 
     While the lock plate  310  is in the lock state, a vehicle parked in the parking space cannot move off the parking space. On the other hand, while the lock plate  310  is in the unlock state, a vehicle parked in the parking space can move off the parking space. While the lock plate  310  is in the unlock state, and no vehicle is parked in the parking space, a vehicle can be parked in the parking space. While the lock plate  310  is in the lock state, no vehicle can be parked in the parking space even when no other vehicle is parked in the parking space.  FIG. 1  illustrates the lock plate  310  in the lock state. 
     The hydrogen vehicle  400  is a vehicle that uses hydrogen to run. The hydrogen vehicle  400  includes a hydrogen gas storing unit  404 , a fuel cell device  406 , a controller  450 , communication interfaces  462  and  464 , and a display panel  470 . 
     The hydrogen gas storing unit  404  is a tank that stores hydrogen gas. The hydrogen gas storing unit  404  can store hydrogen gas at a maximum amount of approximately 130 liters under a pressure of approximately 70 MPa. The fuel cell device  406  is supplied with hydrogen gas from the hydrogen gas storing unit  404 , uses hydrogen, and generates electric power. The hydrogen vehicle  400  runs by causing an electric motor (not illustrated) to use electric power generated by the fuel cell device  406 . 
     The controller  450  controls devices of the hydrogen vehicle  400 . The controller  450  includes a CPU  451  serving as a processor, a RAM  452 , and a ROM  453 . The CPU  451  exchanges various kinds of information with a device outside of the hydrogen vehicle  400 , and stores in the RAM  452  the obtained information or information generated from the obtained information. The communication interfaces each allowing the controller  450  to exchange various kinds of information with a device outside of the hydrogen vehicle  400  are respectively illustrated as  462  and  464 . 
     The display panel  470  includes a display provided with a touch panel, as well as includes a microphone and a speaker. The display panel  470  outputs information stored by the controller  450  to a user of the hydrogen vehicle  400 . The display panel  470  delivers information input externally to the controller  450 . 
     The point management server  100  manages points issued by the hydrogen gas supply facilities  200 A and  200 B. Specifically, the point management server  100  receives changed-point information ΔIp indicative of points issued by the hydrogen gas supply facilities  200 A and  200 B, links the changed-point information ΔIp to individual users, and stores and manages point information Ip indicative of the points. The point management server  100  includes a controller  150 . 
     The controller  150  includes a CPU  151  serving as a processor, a RAM  152 , and a ROM  153 . The controller  150  is installed with a control program that processes the point information Ip. In the controller  150 , the CPU  151 , the RAM  152 , and the ROM  153  serving as hardware resources and the control program cooperate with each other. Specifically, the CPU  151  loads the computer program stored in the ROM  153  into the RAM  152  and executes the computer program to achieve various functions. The RAM  152  stores information obtained or generated by the CPU  151 . The communication interfaces each allowing the controller  150  to exchange various kinds of information with a device outside of the point management server  100  are respectively illustrated as  162  and  164 . 
     A2. Exchanging Information in Hydrogen Management System 
     (1) Receiving Hydrogen in Hydrogen Gas Supply Facility: 
     Hydrogen generated in the hydrogen generation facility  500 A is delivered by the hydrogen gas delivery vehicle  600 A to the hydrogen gas supply facility  200 A, and accommodated in the hydrogen gas storing unit  204 . The hydrogen gas delivery vehicle  600 A stores, in the RAM  652 , the burden information Ii indicative of an environmental burden exerted when hydrogen is generated and manufactured in the hydrogen generation facility  500 A, and the quality information Iq indicative of quality with respect to the hydrogen generated in the hydrogen generation facility  500 A. 
     The burden information Ii with respect to hydrogen generated in the hydrogen generation facility  500 A is referred to as burden information IiA. The quality information Iq with respect to the hydrogen generated in the hydrogen generation facility  500 A is referred to as quality information IqA. On the other hand, the burden information Ii with respect to hydrogen generated in the hydrogen generation facility  500 B is referred to as burden information IiB. The quality information Iq with respect to the hydrogen generated in the hydrogen generation facility  500 B is referred to as quality information IqB. 
     The burden information Ii is determined based on an amount of fossil fuel consumed for generating hydrogen at an amount of 1 mol or an amount of carbon dioxide generated for generating hydrogen at an amount of 1 mol. The quality information Iq includes information on whether the hydrogen satisfies (i) ISO14687 1999 Type I, Grade A, (ii) ISO14687-2 2008 Type I, Grade D, or (iii) ISO14687-2 2012 Type I, Grade D. 
     When hydrogen is received from the hydrogen gas delivery vehicle  600 A to the hydrogen gas storing unit  204 , the control device  250  receives the burden information IiA and the quality information IqA stored in the RAM  652  of the hydrogen gas delivery vehicle  600 A. Specifically, the communication interface  262  receives the burden information Ii with respect to hydrogen received externally by the hydrogen gas storing unit  204  and the quality information Iq with respect to the hydrogen received externally by the hydrogen gas storing unit  204 . Each time hydrogen is received from the hydrogen gas delivery vehicle  600 A to the hydrogen gas storing unit  204 , the control device  250  links an amount of the received hydrogen to the burden information IiA and the quality information IqA, and stores in the RAM  252  the linked information. 
     An amount of hydrogen received in the hydrogen gas storing unit  204  can be calculated based on, for example, pressure and temperature in the hydrogen gas storing unit  204  before and after the hydrogen is received from the hydrogen gas delivery vehicle  600 A to the hydrogen gas storing unit  204 . Here assumes that the hydrogen gas storing unit  204  can store gas at a constant volume. An amount of hydrogen provided to outside of the hydrogen gas storing unit  204  can be calculated with the identical method. 
     Hydrogen generated in the hydrogen generation facility  500 B is delivered by the hydrogen gas delivery vehicle  600 B to the hydrogen gas supply facility  200 A, and accommodated in the hydrogen gas storing unit  204 . The hydrogen gas delivery vehicle  600 B stores, in the RAM  652 , the burden information IiB indicative of an environmental burden exerted when hydrogen is generated and manufactured in the hydrogen generation facility  500 B, and the quality information IqB indicative of quality with respect to the hydrogen generated in the hydrogen generation facility  500 B. 
     The burden information IiB with respect to hydrogen generated in the hydrogen generation facility  500 B through photovoltaic power generation is indicative of that an environmental burden is lesser, compared with the burden information IiA with respect to hydrogen generated in the hydrogen generation facility  500 A by using fossil fuel. In the present embodiment, the quality information IqB of quality with respect to hydrogen generated in the hydrogen generation facility  500 B is indicative of that the hydrogen is higher in quality, compared with the quality information IqA of quality with respect to hydrogen generated in the hydrogen generation facility  500 A. 
     When hydrogen is received from the hydrogen gas delivery vehicle  600 B to the hydrogen gas storing unit  204 , the control device  250  receives the burden information IiB and the quality information IqB via the communication interface  262 . Each time hydrogen is received from the hydrogen gas delivery vehicle  600 B to the hydrogen gas storing unit  204 , the control device  250  links an amount of the received hydrogen to the burden information IiB and the quality information IqB, and stores in the RAM  252  the linked information. 
     The control device  250  performs processing described below each time hydrogen is received from outside. The control device  250  calculates a current amount of hydrogen stored in the hydrogen gas storing unit  204 . The control device  250  further calculates, in the current amount, a ratio of an amount of hydrogen linked to the burden information IiA and a ratio of an amount of hydrogen linked to the burden information IiB. The control device  250  then stores the calculated amount and ratios in the RAM  252  as a part of the burden information Ii. In other words, the RAM  252  stores, as a part of the burden information Ii, the burden information IiA and the burden information IiB with respect to hydrogen, which are respectively linked to information IvA and information IvB of amounts of hydrogen. As a result, the burden information Ii in the RAM  252  includes information separately indicative of hydrogen obtained by allowing fossil fuel and water to react with each other and hydrogen obtained by allowing water to undergo electrolysis with electric power obtained by utilizing natural energy. Based on the information, constituting portions G 11  and G 12  in the graph in  FIG. 2 , described later, are generated. Unless otherwise required to be separately described per different environmental burden, information on an amount of hydrogen is simply referred to as “information Iv of an amount of hydrogen”. 
     By generating and storing the burden information Ii described above, the hydrogen gas supply facility  200 A can satisfy a user willingly accepting supply of, instead of hydrogen obtained by allowing fossil fuel and water to react with each other, hydrogen obtained by allowing water to undergo electrolysis with electric power obtained by utilizing natural energy. 
     The control device  250  calculates a current amount of hydrogen stored in the hydrogen gas storing unit  204 . The control device  250  further calculates, in the current amount, a ratio of an amount of hydrogen linked to the quality information IqA and a ratio of an amount of hydrogen linked to the quality information IqB. The control device  250  then stores in the RAM  252  the calculated amount and ratios as a part of the quality information Iq. In other words, the RAM  252  stores, as a part of the quality information Iq, the quality information IqA and the quality information IqB with respect to hydrogen, which are respectively linked to the information IvA and the information IvB of amounts of hydrogen. As a result, the quality information Iq includes information separately indicative of hydrogen per a level of quality. 
     In the example in  FIG. 1 , the hydrogen generation facilities from which hydrogen is supplied to the hydrogen gas supply facility  200 A are the hydrogen generation facilities  500 A and  500 B. However, the hydrogen gas supply facility  200 A can further be supplied with hydrogen from another hydrogen gas supply facility (not illustrated). 
     (2) Supplying Hydrogen from Hydrogen Gas Supply Facility to Hydrogen Vehicle: 
     The hydrogen gas supply facility  200 A supplies hydrogen gas to the hydrogen vehicle  400 . The control device  250  of the hydrogen gas supply facility  200 A causes the display panel  270  of the hydrogen gas supply facility  200 A to provide predetermined display to urge a user of the hydrogen vehicle  400  to select hydrogen gas. 
       FIG. 2  is a diagram of display on the display panel  270  of the hydrogen gas supply facility  200 A. The display panel  270  provides the display in  FIG. 2  when the user of the hydrogen vehicle  400  enters, via the display panel  270 , his or her identification information to pay a charge. The display panel  270  provides, buttons B 10 , B 20 , and B 30  indicative of options, bar graphs G 10 , G 20 , and G 30  indicative of environmental burdens with respect to the options, and a button B 50  used to switch a screen to “Quality Display”. 
     The buttons B 10 , B 20 , and B 30  are buttons used to select hydrogen for the hydrogen vehicle  400 . Before hydrogen is supplied from the hydrogen gas storing unit  204  to the user, the control device  250  of the hydrogen gas supply facility  200 A receives, from the user, via one of the buttons B 10 , B 20 , and B 30  displayed on the display panel  270 , designation of an environmental burden with respect to hydrogen to be supplied to the user. 
     The button B 10  provides a “Normal” option to the user. The “Normal” option is an option with which hydrogen stored in the hydrogen gas storing unit  204  of the hydrogen gas supply facility  200 A is supplied as is to the hydrogen vehicle  400 . The button B 20  provides an “Ecology” option to the user. The “Ecology” option is an option with which, in the hydrogen stored in the hydrogen gas storing unit  204  of the hydrogen gas supply facility  200 A, hydrogen generated with a smaller environmental burden in the hydrogen generation facility  500 B is selectively supplied to the hydrogen vehicle  400 . The button B 30  provides an “Economy” option to the user. The “Economy” option is an option with which, in the hydrogen stored in the hydrogen gas storing unit  204  of the hydrogen gas supply facility  200 A, hydrogen generated in the hydrogen generation facility  500 A, which is manufactured at a lower cost and thus is cheaper, is selectively supplied to the hydrogen vehicle  400 . 
     The graph G 10  is a graph indicative of breakdowns of environmental burdens with respect to hydrogen to be provided to a user when the “Normal” option is selected. The breakdowns of the environmental burdens with respect to hydrogen to be provided to a user when the “Normal” option is selected equal to breakdowns of environmental burdens with respect to hydrogen stored in the hydrogen gas storing unit  204 . The graph G 10  includes the portion G 11  and the portion G 12 . 
     The portion G 11  is colored in orange. The portion G 11  is indicative of, in hydrogen stored in the hydrogen gas storing unit  204 , a ratio of hydrogen obtained by allowing fossil fuel and water to react with each other. In the present embodiment, the portion G 11  is indicative of a ratio of hydrogen generated in the hydrogen generation facility  500 A. 
     The portion G 12  is colored in blue. The portion G 12  is indicative of, in the hydrogen stored in the hydrogen gas storing unit  204 , a ratio of hydrogen obtained by allowing water to undergo electrolysis with electric power obtained by utilizing natural energy. In the present embodiment, the portion G 12  is indicative of a ratio of hydrogen generated in the hydrogen generation facility  500 B. 
     The graph G 20  is a graph indicative of breakdowns of environmental burdens with respect to hydrogen to be provided to a user when the “Ecology” option is selected. The graph G 20  is colored in blue. Hydrogen to be provided to a user when the “Ecology” option is selected is hydrogen wholly obtained by allowing water to undergo electrolysis with electric power obtained by utilizing natural energy. In the present embodiment, hydrogen to be provided to a user when the “Ecology” option is selected is hydrogen generated in the hydrogen generation facility  500 B. 
     The graph G 30  is a graph indicative of breakdowns of environmental burdens with respect to hydrogen to be provided to a user when the “Economy” option is selected. The graph G 30  is colored in orange. Hydrogen to be provided to a user when the “Economy” option is selected is hydrogen wholly obtained by allowing fossil fuel and water to react with each other. In the present embodiment, hydrogen to be provided to a user when the “Economy” option is selected is hydrogen generated in the hydrogen generation facility  500 A. 
     The buttons B 10 , B 20 , and B 30  each display a price of hydrogen per 1 kg for the hydrogen vehicle  400 . Hydrogen generated in the hydrogen generation facility  500 B is higher in manufacturing cost than hydrogen generated in the hydrogen generation facility  500 A. Accordingly, the “Ecology” option is higher in unit price than the “Normal” option. The “Economy” option is lower in unit price than the “Normal” option. 
     A user of the hydrogen vehicle  400 , who thinks that hydrogen to be consumed by himself or herself should be manufactured through a method offering a smaller environmental burden, as well as thinks that a cost for that purpose should be paid by himself or herself, willingly selects B 20 , i.e., “Ecology”. A user of the hydrogen vehicle  400 , who thinks that a cost of hydrogen to be consumed by himself or herself is suppressed as lower as possible, willingly selects B 30 , i.e., “Economy”. Other users select B 10 , i.e., “Normal”. 
     By performing such processing as described above, a user can designate, before accepting supply of hydrogen, for example, as hydrogen to be supplied, hydrogen that has exerted a smaller environmental burden during manufacturing to urge an administrator of the hydrogen gas supply facility  200 A to utilize hydrogen that has exerted a smaller environmental burden. 
     Even when the “Ecology” or “Economy” option is selected, in actual cases, not only hydrogen manufactured in a certain hydrogen generation facility, but also hydrogen manufactured in other hydrogen generation facilities, in hydrogen stored in the hydrogen gas storing unit  204 , will be supplied to the hydrogen vehicle  400 . That is, hydrogen stored in the hydrogen gas storing unit  204  of the hydrogen gas supply facility  200 A will be supplied to the hydrogen vehicle  400  without any selections. 
     However, a ratio of an amount of hydrogen linked to the burden information IiA and a ratio of an amount of hydrogen linked to the burden information IiB in an amount of hydrogen stored in the hydrogen gas storing unit  204  are recalculated in accordance with a selected option. That is, the control device  250  updates respective pieces of information on environmental burdens different from each other in the burden information Ii, which are respectively linked to pieces of information on amounts of hydrogen and stored in the RAM  252 , based on a designated environmental burden and an amount Δv 1  of hydrogen supplied from the hydrogen gas storing unit  204  to a user. 
     When the “Ecology” option is selected, it is assumed that hydrogen supplied at an amount to the hydrogen vehicle  400 , in hydrogen linked to the burden information IiA in hydrogen stored in the hydrogen gas storing unit  204 , has been used. Then a ratio of an amount of hydrogen linked to the burden information IiA and a ratio of an amount of hydrogen linked to the burden information IiB are recalculated. When the “Economy” option is selected, it is assumed that hydrogen supplied at an amount to the hydrogen vehicle  400 , in hydrogen linked to the burden information IiB in hydrogen stored in the hydrogen gas storing unit  204 , has been used. Then a ratio of an amount of hydrogen linked to the burden information IiA and a ratio of an amount of hydrogen linked to the burden information IiB are recalculated. When the “Normal” option is selected, a whole amount of hydrogen stored in the hydrogen gas storing unit  204  reduces. However, a ratio of an amount of hydrogen linked to the burden information IiA and a ratio of an amount of hydrogen linked to the burden information IiB do not change. 
     The button B 50  is a button used to display, instead of the options based on the burden information Ii indicative of environmental burdens, as illustrated in  FIG. 2 , options based on the quality information Iq indicative of quality. 
     In accordance with an option selected on the screen in  FIG. 2  and the amount Δv 1  of hydrogen supplied to the hydrogen vehicle  400 , the control device  250  of the hydrogen gas supply facility  200 A issues to the user a point exchangeable with a product or at least a part of a service. No point will be issued to a user who has selected an option on a screen in  FIG. 3 , described later. 
     The control device  250  issues one point per an amount of hydrogen of 1 kg to a user selecting, on the screen in  FIG. 2 , as the environmental burden with respect to hydrogen to be supplied, the “Ecology” option designating a smaller environmental burden than an environmental burden with respect to “Economy” or “Normal” to receive supply of the hydrogen. The control device  250  issues 0.5 points per an amount of hydrogen of 1 kg to a user selecting, as the environmental burden with respect to hydrogen to be supplied, the “Normal” option designating a smaller environmental burden than the environmental burden with respect to “Economy” to receive supply of the hydrogen. 
     Specifically, the issued points are sent, as the changed-point information ΔIp, via the communication interface  264  of the hydrogen gas supply facility  200 A and the communication interface  462  of the hydrogen vehicle  400 , to the controller  450 . 
     The control device  250  issues no points to a user selecting, on the screen in  FIG. 2 , as the environmental burden with respect to hydrogen to be supplied, the “Economy” option designating a greater environmental burden than the environmental burden with respect to “Ecology” or “Normal” to receive supply of the hydrogen. 
     A user can beneficially designate, as an environmental burden with respect to hydrogen to be supplied, a smaller environmental burden. This urges a user to utilize hydrogen that has exerted a smaller environmental burden. 
       FIG. 3  is a diagram of display on the display panel  270  of the hydrogen gas supply facility  200 A. When the button B 50  is pressed in the state in  FIG. 2 , the control device  250  causes, based on the quality information Iq indicative of quality, the display panel  270  to provide options illustrated in  FIG. 3 . In that case, buttons B 15 , B 25 , and B 35  respectively indicative of “Normal”, “High Quality”, and “Economy” options are provided. 
     The “Normal” option is an option with which hydrogen stored in the hydrogen gas storing unit  204  of the hydrogen gas supply facility  200 A is supplied as is to the hydrogen vehicle  400 . The “High Quality” option is an option with which, in the hydrogen stored in the hydrogen gas storing unit  204 , hydrogen generated in either of the hydrogen generation facilities  500 A and  500 B, whichever is higher in quality, is selectively supplied to the hydrogen vehicle  400 . In the present embodiment, hydrogen to be provided to a user when the “High Quality” option is selected is hydrogen generated in the hydrogen generation facility  500 B. The “Economy” option is an option with which, in the hydrogen stored in the hydrogen gas storing unit  204 , hydrogen generated in either of the hydrogen generation facilities  500 A and  500 B, whichever is lower in manufacturing cost, is selectively supplied to the hydrogen vehicle  400 . In the present embodiment, hydrogen to be provided to a user when the “Economy” option is selected is hydrogen generated in the hydrogen generation facility  500 A. 
     Next to the buttons B 15 , B 25 , and B 35  indicative of the options, similar to the case in  FIG. 2 , bar graphs G 15 , G 25 , and G 35  respectively indicative of breakdowns of hydrogen to be supplied under the options are provided. 
     The graph G 15  is a graph indicative of breakdowns of environmental burdens with respect to hydrogen to be provided to a user when the “Normal” option is selected. A portion G 16  in the graph G 15  is colored in orange. The portion G 16  is indicative of, in hydrogen stored in the hydrogen gas storing unit  204 , a ratio of hydrogen obtained by allowing fossil fuel and water to react with each other. A portion G 17  in the graph G 15  is colored in blue. The portion G 17  is indicative of, in the hydrogen stored in the hydrogen gas storing unit  204 , a ratio of hydrogen obtained by allowing water to undergo electrolysis with electric power obtained by utilizing natural energy. 
     The graph G 25  is a graph indicative of breakdowns of environmental burdens with respect to hydrogen to be provided to a user when the “High Quality” option is selected. The graph G 25  is colored in blue. In the present embodiment, hydrogen to be provided to a user when the “High Quality” option is selected is hydrogen generated in the hydrogen generation facility  500 B. 
     The graph G 35  is a graph indicative of breakdowns of environmental burdens with respect to hydrogen to be provided to a user when the “Economy” option is selected. The graph G 35  is colored in orange. In the present embodiment, hydrogen to be provided to a user when the “Economy” option is selected is hydrogen generated in the hydrogen generation facility  500 A. 
     The display in  FIG. 3  provides, as a button used to switch the screen to the state in  FIG. 2 , an “Environment Display” button B 55 , instead of the “Quality Display” button B 50 . 
     When hydrogen is to be received from the hydrogen gas supply facility  200 A to the hydrogen gas storing unit  404 , the controller  450  of the hydrogen vehicle  400  receives, from the control device  250 , the burden information Ii, the quality information Iq, and the changed-point information ΔIp with respect to the hydrogen to be received (see  FIG. 1 ). Specifically, the controller  450  receives the burden information Ii, the quality information Iq, and the changed-point information ΔIp via the communication interface  264  of the hydrogen gas supply facility  200 A and the communication interface  462  of the hydrogen vehicle  400 . 
     Each time hydrogen is received from the hydrogen gas supply facility  200 A or the hydrogen gas supply facility  200 B to the hydrogen gas storing unit  404 , the controller  450  links the amount Δv 1  of the hydrogen to the burden information Ii and the quality information Iq, and stores in the RAM  452  the linked information. 
     Each time hydrogen is received from the hydrogen gas supply facility  200 A or the hydrogen gas supply facility  200 B to the hydrogen gas storing unit  204 , the controller  450  sums points indicated by the changed-point information ΔIp and stores in the RAM  452  the resultant information. The controller  450  separately sums a number of points added in past 30 days and stores in the RAM  452  the resultant information. 
       FIG. 4  is a front view of the hydrogen vehicle  400 . The hydrogen vehicle  400  is provided with an emblem  482  representing the vehicle or a manufacturer of the vehicle at a center on a front. The emblem can emit light in various colors. The hydrogen vehicle  400  is provided with a pair of light-emitting portions  484  respectively on left and right sides of a lower portion with respect to the emblem  482  inside of a front bumper. The light-emitting portions  484  can also emit light in various colors. 
     When a number of points added in past 30 days does not exceed a threshold, the controller  450  causes the emblem  482  and the light-emitting portions  484  to emit light in orange. When a number of points added in past 30 days exceeds the threshold, the controller  450  causes the emblem  482  and the light-emitting portions  484  to emit light in blue. By performing such processing as described above, a user who is willing to bear a cost for reducing environmental burdens can differentiate himself or herself from users who are not willing to do so. 
     The CPU  151  of the controller  150  of the point management server  100  links identification information on a user to manage points issued to the user. In association with an individual identified by identification information, i.e., a user to which points are issued, the CPU  151  stores in the RAM  152  the point information Ip indicative of the points issued to the user. Points issued to a user are obtained by summing points indicated by the changed-point information ΔIp. 
     When the control devices  250  of the hydrogen gas supply facilities  200 A and  200 B have issued points to a user, the control device  250  of the hydrogen gas supply facility  200 A sends, to the point management server  100 , the changed-point information ΔIp sent to the hydrogen vehicle  400 , together with identification information identifying the user of the hydrogen vehicle  400  (see  FIG. 1 ). Specifically, the controller  150  of the point management server  100  receives the changed-point information ΔIp and the identification information via the communication interface  264  of the hydrogen gas supply facility  200 A and the communication interface  162  of the point management server  100 . 
     The CPU  151  of the point management server  100  receives the changed-point information ΔIp indicative of the points issued to the user, from the hydrogen gas supply facilities  200 A and  200 B via the communication interface  162 . Based on the changed-point information ΔIp indicative of the issued points, the CPU  151  adds the issued points to points indicated by the point information Ip linked to the user and stored in the RAM  152 . 
     By performing such processing as described above, a user can obtain benefits in accordance with an amount of supplied hydrogen that has exerted a smaller environmental burden. This urges a user to utilize hydrogen that has exerted a smaller environmental burden. 
     Upon a request from a user to the point management server  100 , the CPU  151  outputs the point information Ip linked to the user and stored in the RAM  152  via the communication interface  164 . Specifically, a user provides a request via the controller  450  and the communication interface  464  of the hydrogen vehicle  400  and the communication interface  162  of the point management server  100 . The point information Ip output from the point management server  100  is received by the controller  450  via the communication interface  164  of the point management server  100  and the communication interface  462  of the hydrogen vehicle  400 , and is displayed on the display panel  470  of the hydrogen vehicle  400 . 
     The CPU  151  of the point management server  100  calculates points issued to a user per month. Information Ipp of points issued to the user in a last-past month is linked to the user and stored in the RAM  152 . In accordance with a request from an external device such as the service management device  300 , the CPU  151  outputs, via the communication interface  164 , the information Ipp of points issued to the user in the previous month, which is linked to the user and stored in the RAM  152 . 
     By performing such processing as described above, a service or a product can be provided to a user in accordance with points issued in a previous month to the user as a predetermined period. 
     (3) Utilizing Points: 
       FIG. 5  is a plan view of a pay parking lot P 0  provided adjacent to a facility. The pay parking lot P 0  is provided with entrances En 1  and En 2  to the facility, the service management device  300 , and a plurality of parking spaces P 11  to P 15  and P 21  to P 25 . The parking spaces P 11  to P 15  and P 21  to P 25  are each provided with the lock plate  310  (see  FIG. 1 ). 
     When the hydrogen vehicle  400  enters the pay parking lot P 0 , processing described below is performed. That is, the controller  450  obtains beforehand identification information on the driver, and stores the identification information in the RAM  452 , when a driver begins driving. When the hydrogen vehicle  400  enters the pay parking lot P 0 , the controller  450  sends the identification information to the service management device  300 . Specifically, the controller  350  of the service management device  300  receives the identification information on the driver via the communication interface  462  of the hydrogen vehicle  400  and the communication interface  362  of the service management device  300 . 
     The CPU  351  of the controller  350  of the service management device  300  sends, via the communication interface  364 , the identification information on the driver to the point management server  100  to ask for the information Ipp of points issued in a previous month to the user. The CPU  351  of the service management device  300  receives, via the communication interface  362 , from the point management server  100 , the information Ipp of the points issued in the previous month to the user. 
     The CPU  351  of the service management device  300  does not permit a user having a smaller number of points issued in the previous month than a threshold to park a vehicle in one of some of parking spaces adjacent to the entrances En 1  and En 2  to the facility, i.e., in one of the parking spaces P 11  to P 13  and P 21  to P 23 . On the other hand, the CPU  351  permits a user having a greater number of points issued in the previous month than the threshold to park a vehicle in one of the parking spaces P 11  to P 13  and P 21  to P 23 . 
     Specifically, the CPU  351  causes the lock plates  310  in all parking spaces where no vehicles are parked, among the parking spaces P 11  to P 15  and P 21  to P 25 , to each be in the unlock state, for a user having a greater number of points issued in the previous month than the threshold. The hydrogen vehicle  400  driven by such a user can be parked in a desired parking space where the lock plate  310  is in the unlock state. 
     On the other hand, when a number of points issued in the previous month is smaller than the threshold, the CPU  351  of the service management device  300  causes, to each be in the unlock state, the lock plates  310  in the parking spaces where no vehicles are parked, among the four parking spaces P 14 , P 15 , P 24 , and P 25  that are farther from the entrances En 1  and En 2  to the facility than the parking spaces P 11  to P 13  and P 21  to P 23 . The CPU  351  then causes the lock plates  310  in the parking spaces P 11  to P 13  and P 21  to P 23  to each be in the lock state. The hydrogen vehicle  400  can be parked in one of the parking spaces where the lock plates  310  are each be in the unlock state among the four parking spaces P 14 , P 15 , P 24 , and P 25 . The parking spaces P 14 , P 15 , P 24 , and P 25  are crosshatched in  FIG. 5 . 
     By constantly accepting supply of hydrogen that has exerted a smaller environmental burden, a user can beneficially park a vehicle in a parking space adjacent to the entrances En 1  and En 2 . This urges a user to utilize hydrogen that has exerted a smaller environmental burden. 
     After a certain period has passed from when the hydrogen vehicle  400  is parked in the parking space, the lock plate  310  in the parking space in which the hydrogen vehicle  400  is parked turns into the lock state. 
     When the hydrogen vehicle  400  is about to move off the pay parking lot P 0 , processing described below is performed. That is, the CPU  351  of the service management device  300  calculates points to be subtracted from points possessed by the user in accordance with a period of provision of the parking space to the user. 
     The CPU  351  of the service management device  300  causes, via the communication interface  364  of the service management device  300  and the communication interface  462  of the hydrogen vehicle  400 , the display panel  470  of the hydrogen vehicle  400  to display the points to be subtracted from the points possessed by the user. The display panel  370  of the service management device  300  also displays similar information. 
     When the user of the hydrogen vehicle  400  makes an entry indicative of agreement of paying the displayed points via the display panel  470  or the display panel  370 , the CPU  351  of the service management device  300  links the changed-point information ΔIp indicative of the points to be subtracted to the identification information on the user, and sends the linked information, via the communication interface  364 , to the point management server  100 . 
     The CPU  151  of the point management server  100  receives, via the communication interface  162 , from the service management device  300 , the changed-point information ΔIp indicative of the used points and linked to the identification information on the user. The CPU  151  subtracts the used points from the points indicated by the point information Ip that is linked to the user corresponding to the identification information and that is stored in the RAM  152 . 
     Meanwhile, when the user of the hydrogen vehicle  400  makes the entry indicative of agreement of paying the displayed points via the display panel  470 , the CPU  351  of the service management device  300  causes the lock plate  310  in the parking space in which the hydrogen vehicle  400  is parked to be in the unlock state. As a result, the hydrogen vehicle  400  can move off the parking space. 
     With the aspect described above, a user can obtain a service or a product in accordance with an amount of supplied hydrogen that has exerted a smaller environmental burden. This urges a user to utilize hydrogen that has exerted a smaller environmental burden. 
     (4) Exchanging Burden Information with Hydrogen Gas Supply Facility: 
     In hydrogen stored in the hydrogen gas storing unit  204  of the hydrogen gas supply facility  200 A, a ratio of hydrogen generated in the hydrogen generation facility  500 A and a ratio of hydrogen generated in the hydrogen generation facility  500 B are primitively determined in accordance with an amount of hydrogen generated in the hydrogen generation facility  500 A and supplied to the hydrogen gas storing unit  204  and an amount of hydrogen generated in the hydrogen generation facility  500 B and supplied to the hydrogen gas storing unit  204 . However, in the hydrogen stored in the hydrogen gas storing unit  204 , the ratio of the hydrogen generated in the hydrogen generation facility  500 A and the ratio of the hydrogen generated in the hydrogen generation facility  500 B can vary through exchange of burden information among the hydrogen gas supply facilities. 
     The distance from the hydrogen gas supply facility  200 B to the nearest hydrogen generation facility that utilizes natural energy to generate hydrogen is three or more times of the distance from the hydrogen gas supply facility  200 A to the hydrogen generation facility  500 B that utilizes natural energy to generate hydrogen. Delivering hydrogen from such a hydrogen generation facility that utilizes natural energy to generate hydrogen to the hydrogen gas supply facility  200 B is inefficient. The hydrogen gas supply facility  200 B therefore receives supply of hydrogen from other nearer hydrogen generation facilities than the hydrogen generation facility that utilizes natural energy to generate hydrogen. 
     The hydrogen gas supply facility  200 B cannot primitively provide the “Ecology” option in supplying hydrogen (see  FIG. 2 ). With processing described below in the present embodiment, however, the “Ecology” option can be provided in supplying hydrogen in the hydrogen gas supply facility  200 B. 
     The control device  250  of the hydrogen gas supply facility  200 A links information ΔIi including at least some of the burden information Ii that is linked to the information Iv of an amount of hydrogen and that is stored in the RAM  252  of the hydrogen gas supply facility  200 A to information ΔIv 2  of a predetermined amount of hydrogen, and sends the linked information, via the communication interface  266  of the hydrogen gas supply facility  200 A, to the hydrogen gas supply facility  200 B (see  FIG. 1 ). The control device  250  of the hydrogen gas supply facility  200 B links the information ΔIi including the at least some of the burden information Ii with respect to the hydrogen gas supply facility  200 A, which is sent from the hydrogen gas supply facility  200 A, to the information ΔIv 2  of the amount of some of hydrogen stored in the hydrogen gas storing unit  204 , and receives the linked information, via the communication interface  266  of the hydrogen gas supply facility  200 B, from the hydrogen gas supply facility  200 A. 
     On the other hand, the control device  250  of the hydrogen gas supply facility  200 B links the information ΔIi including at least some of the burden information Ii that is linked to the information Iv of an amount of hydrogen and that is stored in the RAM  252  of the hydrogen gas supply facility  200 B to the information ΔIv 2  indicative of an amount of hydrogen, which is identical to the amount indicated by the information ΔIv 2  of the predetermined amount of the hydrogen and is sent from the hydrogen gas supply facility  200 A, and sends the linked information to the hydrogen gas supply facility  200 A (see  FIG. 1 ). The control device  250  of the hydrogen gas supply facility  200 A links the information ΔIi including the at least some of the burden information Ii with respect to the hydrogen gas supply facility  200 B, which is sent from the hydrogen gas supply facility  200 B, to the information ΔIv 2  of the amount of the some of the hydrogen stored in the hydrogen gas storing unit  204  of the hydrogen gas supply facility  200 B, and receives the linked information from the hydrogen gas supply facility  200 B. 
     The control device  250  of the hydrogen gas supply facility  200 A updates the burden information Ii that is linked to the information Iv of the amount of the hydrogen and that is stored in the RAM  252  of the hydrogen gas supply facility  200 A, based on the information ΔIi including the at least some of the burden information and sent to the hydrogen gas supply facility  200 B and the information ΔIv 2  of the amount of the hydrogen. 
     Furthermore, the control device  250  of the hydrogen gas supply facility  200 A updates the burden information Ii that is linked to the information Iv of the amount of the hydrogen and that is stored in the RAM  252  of the hydrogen gas supply facility  200 A, based on the information ΔIi including the at least some of the burden information and received from the hydrogen gas supply facility  200 B and the information ΔIv 2  of the amount of the hydrogen. Before and after the updates, an amount of hydrogen stored in the hydrogen gas storing unit  204  of the hydrogen gas supply facility  200 A does not change. 
     On the other hand, the control device  250  of the hydrogen gas supply facility  200 B updates the burden information Ii that is linked to the information Iv of the amount of the hydrogen and that is stored in the RAM  252  of the hydrogen gas supply facility  200 B, based on the information ΔIi including the at least some of the burden information and sent to the hydrogen gas supply facility  200 A and the information ΔIv 2  of the amount of the hydrogen. 
     Furthermore, the control device  250  of the hydrogen gas supply facility  200 B updates the burden information Ii that is linked to the information Iv of the amount of the hydrogen and that is stored in the RAM  252  of the hydrogen gas supply facility  200 B, based on the information ΔIi including the at least some of the burden information and received from the hydrogen gas supply facility  200 A and the information ΔIv 2  of the amount of the hydrogen. Before and after the updates, an amount of hydrogen stored in the hydrogen gas storing unit  204  of the hydrogen gas supply facility  200 B does not change. 
     That is, under an assumption that hydrogen generated by utilizing natural energy is supplied from the hydrogen gas supply facility  200 A to the hydrogen gas supply facility  200 B, and, alternately, hydrogen at an identical amount is supplied from the hydrogen gas supply facility  200 B to the hydrogen gas supply facility  200 A, a ratio of an amount of hydrogen linked to the burden information IA and a ratio of an amount of hydrogen linked to the burden information IiB, in hydrogen stored in the hydrogen gas storing unit  204 , are respectively recalculated in each of the hydrogen gas supply facilities  200 A and  200 B. The ratios are stored in the RAM  252  of the control device  250  in each of the hydrogen gas supply facilities  200 A and  200 B. At that time, no hydrogen gas is actually exchanged. 
     After that, when hydrogen gas is supplied to the hydrogen vehicle  400  in each of the hydrogen gas supply facilities  200 A and  200 B, the display in  FIG. 2  is provided in accordance with the recalculated ratios. In the display on the display panel  270  of the hydrogen gas supply facility  200 A, the display of the graph G 10  in  FIG. 2  and the display of the graph G 15  in  FIG. 3  match with each other. After the information is exchanged as described above, however, the display of the graph G 10  in  FIG. 2  changes. Accordingly, in the display on the display panel  270  of the hydrogen gas supply facility  200 A, the display of the graph G 10  in  FIG. 2  and the display of the graph G 15  in  FIG. 3  do not match with each other. 
     By performing such processing as described above, separately from the burden information Ii with respect to hydrogen actually received by the hydrogen gas storing unit  204  of the hydrogen gas supply facility  200 B, the burden information Ii with respect to hydrogen can be shared between the plurality of hydrogen gas supply facilities  200 A and  200 B. Without actually moving hydrogen, supply of hydrogen that has exerted a smaller environmental burden can be facilitated as a whole among the hydrogen gas supply facilities  200 A and  200 B. 
     In the present embodiment, the hydrogen gas supply facilities  200 A and  200 B are each also sometimes referred to as a “hydrogen gas supply system”. The hydrogen gas storing unit  204  is also sometimes referred to as a “storing unit”. The communication interfaces  262 ,  264 , and  266  are each also sometimes referred to as a “communication unit”. The display panel  270  is also sometimes referred to as a “user interface unit”. The control device  250  is also sometimes referred to as a “controller”. The RAM  252  is also sometimes referred to as a “memory”. An environmental burden exerted when hydrogen is generated and manufactured in the hydrogen generation facility  500 A that allows fossil fuel and water to react with each other to generate the hydrogen is also sometimes referred to as a “first environmental burden”. An environmental burden exerted when hydrogen is generated and manufactured in the hydrogen generation facility  500 B that allows water to undergo electrolysis with electric power obtained by utilizing natural energy to generate the hydrogen is also sometimes referred to as a “second environmental burden”. 
     In the present embodiment, the point management server  100  is also sometimes referred to as a “point management system”. The RAM  152  is also sometimes referred to as a “point memory”. The communication interfaces  162  and  164  are each also sometimes referred to as a “point communication unit”. The CPU  151  is also sometimes referred to as a “point management unit”. 
     In the present embodiment, the service management device  300  is also sometimes referred to as a “point management system”. The CPU  351  is also sometimes referred to as a “service management unit”. The communication interfaces  362  and  364  are each also sometimes referred to as a “service communication unit”. 
     B. Other Embodiments 
     B1. Another Embodiment 1 
     (1) In the embodiment described above, the hydrogen gas supply facility  200 A includes the hydrogen gas storing unit  204  that stores hydrogen gas. The hydrogen gas supply facility  200 A serving as a hydrogen gas supply system may however include, instead of a storing unit that stores hydrogen gas, or in addition to a storing unit that stores hydrogen gas, a storing unit that stores hydrogen liquid. In such an aspect, it is preferable that a hydrogen gas supply system include a device that vaporizes hydrogen, and externally supply the vaporized hydrogen. 
     (2) In the embodiment described above, the communication interfaces of the point management server  100 , the hydrogen gas supply facilities  200 A and  200 B, and the service management device  300  are illustrated by function in the block diagram in  FIG. 1 . The communication interfaces of the point management server  100 , the hydrogen gas supply facilities  200 A and  200 B, and the service management device  300  may however be achieved by one or more of hardware having two or more functions. 
     (3) In the embodiment described above, the display panel  270  outputs the burden information Ii and the quality information Iq with respect to hydrogen to be supplied from the hydrogen gas storing unit  204  to a user (see  FIGS. 1 and 2 ). The burden information Ii and the quality information Iq with respect to hydrogen supplied from the hydrogen gas storing unit  204  to a user may however be sent via the communication interfaces  264  and  462 , and displayed on the display panel  470  of the hydrogen vehicle  400 . That is, the display panel  470  of the hydrogen vehicle  400  may be allowed to function as a user interface unit. 
     (4) In the embodiment described above, the control device  250  of the hydrogen gas supply facility  200 A accepts designation, from a user, of an environmental burden with respect to hydrogen to be supplied to the user, via one of the buttons B 10 , B 20 , and B 30  displayed on the display panel  270  (see  FIG. 2 ). An environmental burden and quality with respect to hydrogen to be supplied from the hydrogen gas storing unit  204  to a user may however be designated from the display panel  470  of the hydrogen vehicle  400  via either of the communication interfaces  464  and  262 . That is, the display panel  470  of the hydrogen vehicle  400  may be allowed to function as a user interface unit. 
     (5) In the embodiment described above, identification information on a user is entered, via the touch panel of the display panel  270 , into the control device  250  of the hydrogen gas supply facility  200 A. Such an aspect can however be applied that the display panel  270  serving as a user interface unit includes a magnetic card reader, an integrated circuit (IC) card reader, or a two-dimensional barcode reader, for example. Via such a reader, identification information on a user is entered into the control device  250  of the hydrogen gas supply facility  200 A. 
     (6) In the embodiment described above, the controller  450  of the hydrogen vehicle  400  is provided in the hydrogen vehicle  400 . However, a portable device such as a smartphone held by a user may serve as a device that allows the controller  450  to execute the processing described above to allow information to be exchanged among the hydrogen gas supply facilities  200 A and  200 B, the service management device  300 , and the point management server  100 . 
     (7) In the embodiment described above, the hydrogen gas supply facility  200 A can provide to users hydrogen generated by allowing water to undergo electrolysis with electric power obtained by utilizing natural energy (see  FIGS. 1 and 2 ). However, the hydrogen gas supply facility  200 A cannot sometimes be supplied with hydrogen obtained by utilizing natural energy. Furthermore, the hydrogen gas supply facility  200 A cannot sometimes be supplied in a virtual manner with hydrogen obtained by utilizing natural energy by exchanging the information ΔIi including at least some of the burden information Ii. In such a case, the graph G 10  displayed on the display panel  270  of the hydrogen gas supply facility  200 A does not indicate the portion G 12 , but only indicates the portion G 11 . The button B 20  and the graph G 20  are each displayed in a lighter color, compared with a case where such hydrogen can be provided. 
     In such a case, a user can view the display on the display panel  270 , and can make a selection to not accept supply of hydrogen from the hydrogen gas supply facility  200 A, but to accept supply of hydrogen from another hydrogen gas supply facility. 
     (8) In the embodiment described above, the controller  450  of the hydrogen vehicle  400  causes, when a number of points added in past 30 days is exceeding the threshold, the emblem  482  and the light-emitting portions  484  to emit light in blue (see  FIG. 4 ). A number of days, during which points are accumulated, for comparing with the threshold, may however be another number of days such as 10 days or 20 days. The controller  450  of the hydrogen vehicle  400  can change display outside of the hydrogen vehicle  400  in accordance with designation of an environmental burden with respect to hydrogen supplied immediately before. 
     (9) In the embodiment described above, the controller  450  of the hydrogen vehicle  400  changes, in accordance with a number of points added in past 30 days, a color of light emitted by the emblem  482  and the light-emitting portions  484  (see  FIG. 4 ). A target to be changed in accordance with a number of obtained points is not however limited to a light-emitting portion. For example, a color of at least a part of a body of the hydrogen vehicle  400  may be changed. Otherwise a part of a shape of the hydrogen vehicle  400  may be changed. 
     (10) In the embodiment described above, the display panel  270  that provides information to an individual user of the hydrogen vehicle  400  to be supplied with hydrogen is controlled by the control device  250  to output the burden information Ii and the quality information Iq with respect to the hydrogen to be supplied from the hydrogen gas storing unit  204  to the user. Information on breakdowns of environmental burdens with respect to hydrogen stored in the hydrogen gas storing unit  204  (see G 10  in  FIG. 2 ) may however be displayed in a real time manner on a signboard of the hydrogen gas supply facility  200 A for unspecified users, for example. By taking such an action, a user can view environmental burden information displayed on such a signboard to determine whether to use the hydrogen gas supply facility  200 A. 
     B2. Another Embodiment 2 
     (1) In the embodiment described above, as methods for generating hydrogen, the method for using fossil fuel in the hydrogen generation facility  500 A and the method for using natural energy in the hydrogen generation facility  500 B are described. Methods for generating hydrogen to be received by hydrogen gas supply systems may however include other methods, in addition to the methods described above, for example, a method for obtaining hydrogen by allowing hydrocarbon obtained from biomass and water vapor to react with each other and a method for obtaining hydrogen as a by-product in iron mills and chemical factories. 
     For example, a hydrogen generation facility can be a facility that generates hydrogen by allowing water to undergo electrolysis with electric power generated from natural energy such as wind power, wave power, and geothermal heat. A hydrogen generation facility can be an iron mill provided with a coke oven serving as a hydrogen manufacturing apparatus. A hydrogen gas generation facility may be a facility that modifies petroleum to extract hydrogen. A hydrogen gas generation facility may be a chemical factory that generates hydrogen as a by-product. 
     Such an aspect may be applied that methods for generating hydrogen to be received by hydrogen gas supply systems do not include one or more of the four methods described above. Furthermore, a hydrogen gas supply system can receive supply of hydrogen that is generated with a plurality of separate methods and that is mixed beforehand. In the present designation, a “method for generating hydrogen” includes mixing of generated hydrogen. 
     The burden information Ii and the quality information Iq with respect to hydrogen generated in a hydrogen generation facility can therefore vary. Each time supply of hydrogen is received from outside, a hydrogen gas supply system links burden information and quality information received from a hydrogen gas delivery vehicle at that time to an amount of the hydrogen received from the hydrogen gas delivery vehicle, and manages the linked information. 
     (2) In the embodiment described above, the quality information Iq includes information on whether the hydrogen satisfies (i) ISO14687 1999 Type I, Grade A, (ii) ISO14687-2 2008 Type I, Grade D, or (iii) ISO14687-2 2012 Type I, Grade D. Such an aspect can however be applied that quality information includes information on quantitative quality with respect to hydrogen provided by each hydrogen generation facility. 
     B3. Another Embodiment 3 
     In the embodiment described above, the hydrogen gas supply facility  200 A receives, from a user, before hydrogen is supplied from the hydrogen gas storing unit  204  to the user, designation of an environmental burden with respect to the hydrogen to be supplied to the user via one of the buttons B 10 , B 20 , and B 30  displayed on the display panel  270 . The environmental burden with respect to hydrogen to be supplied to a user may however be designated after the user is actually supplied with the hydrogen. 
     In the embodiment described above, designation of an environmental burden can be handled separately from an actual method for manufacturing hydrogen. Even when, in hydrogen stored in a storing unit, hydrogen manufactured through a method that has exerted a designated environmental burden is not actually enough, a request from a user can be satisfied by allowing burden information and information on an amount of the hydrogen to be exchanged among hydrogen gas supply systems. 
     B4. Another Embodiment 4 
     (1) In the embodiment described above, the control device  250  of the hydrogen gas supply facility  200 A links the information ΔIi including at least some of the burden information Ii that is linked to the information Iv of an amount of hydrogen and that is stored in the RAM  252  to the information ΔIv 2  of an amount of some of hydrogen stored in the hydrogen gas storing unit  204 , and sends the linked information, via the communication interface  266  of the hydrogen gas supply facility  200 A, to the hydrogen gas supply facility  200 B (see  FIG. 1 ). A hydrogen gas supply system may however send the information ΔIi indicative of an environmental burden exerted during manufacturing of hydrogen, together with information on an excess amount of hydrogen from an amount of hydrogen stored in a storing unit. 
     In the embodiment described above, designation of an environmental burden can be handled separately from an actual method for manufacturing hydrogen. Information on an amount of hydrogen that is not actually accommodated in a storing unit, can therefore be exchanged together with burden information among hydrogen gas supply systems. 
     (2) In the embodiment described above, the control device  250  of the hydrogen gas supply facility  200 A updates the burden information Ii that is linked to information on an amount of hydrogen and that is stored in the RAM  252  of the hydrogen gas supply facility  200 A, based on the information ΔIi including the at least some of burden information sent to the hydrogen gas supply facility  200 B and the information ΔIv 2  of the amount of hydrogen. Such an aspect can however be applied that a hydrogen gas supply system does not update the burden information Ii stored in the RAM  252 , but stores and updates, separately from information on hydrogen in its storing unit, earning and expense due to exchange of burden information with another hydrogen gas supply system. 
     (3) In the embodiment described above, the control device  250  of the hydrogen gas supply facility  200 A links the information ΔIi including the at least some of the burden information Ii that is linked to the information Iv of the amount of hydrogen and that is stored in the RAM  252  to the information ΔIv 2  of the amount of some of hydrogen stored in the hydrogen gas storing unit  204 , and sends the linked information, via the communication interface  266  of the hydrogen gas supply facility  200 A, to the hydrogen gas supply facility  200 B (see  FIG. 1 ). Such an aspect can however be applied that a hydrogen gas supply system does not send such burden information. 
     B5. Another Embodiment 5 
     (1) In the embodiment described above, the control device  250  of the hydrogen gas supply facility  200 B updates the burden information Ii with respect to the hydrogen gas supply facility  200 B, which is stored in the RAM  252  of the hydrogen gas supply facility  200 B, based on the information ΔIi including at least some of burden information received from the hydrogen gas supply facility  200 A and the information ΔIv 2  of an amount of hydrogen. Such an aspect can however be applied that a hydrogen gas supply system does not update the burden information Ii stored in the RAM  252 , but stores and updates, separately from information on hydrogen in its storing unit, earning and expense due to exchange of burden information with another hydrogen gas supply system. 
     (2) In the embodiment described above, the control device  250  of the hydrogen gas supply facility  200 B links the information ΔIi including the at least some of the burden information Ii with respect to the hydrogen gas supply facility  200 A, which is sent from the hydrogen gas supply facility  200 A, to the information ΔIv 2  of the amount of some of hydrogen stored in the hydrogen gas storing unit  204 , and receives the linked information, via the communication interface  266  of the hydrogen gas supply facility  200 B, from the hydrogen gas supply facility  200 A. Such an aspect can however be applied that a hydrogen gas supply system does not receive such burden information. 
     B6. Another Embodiment 6 
     In the embodiment described above, a number of points to be issued to a user selecting the “Ecology” option is one per an amount of hydrogen of 1 kg. A number of points to be issued to a user selecting the “Normal” option is 0.5 per an amount of hydrogen of 1 kg. The control device  250  issues no points to a user selecting the “Economy” option to accept supply of the hydrogen. A method for issuing points to a user may however be another method. 
     For example, points may be issued to a user designating hydrogen generated through a method that has exerted environmental burdens at a highest amount. Such an aspect can be applied that a number of points to be issued is not determined in accordance with an amount of hydrogen, but points determined beforehand are issued each time hydrogen is supplied. Specific values of points to be issued can be specified as desired, such as five points and ten points. 
     B7. Another Embodiment 7 
     In the embodiment described above, the point management server  100  manages points issued by the hydrogen gas supply facilities  200 A and  200 B. Such an aspect can however be applied that no such device that collectively manages points is provided, but information is shared in a cloud-computing manner and is updated by each hydrogen gas supply system. 
     B8. Another Embodiment 8 
     (1) In the embodiment described above, as a user utilizes a service, the CPU  151  of the point management server  100  subtracts points corresponding to the provided service from points indicated by the point information Ip that is linked to the user corresponding to identification information and that is stored in the RAM  152 . Such an aspect can however be applied that a point management unit of a point management system sends to a service management system the point information Ip with respect to a user, and receives, from the service management system, subtracted points of the user to manage the points of the user. 
     (2) Charges upon utilization of services and upon receipt of products may be paid by means of, instead of points, another charge paying system, credit cards, and cash, for example. 
     B9. Another Embodiment 9 
     (1) In the embodiment described above, the CPU  151  of the point management server  100  links, to a user, the information Ipp of points issued to the user in a last-past month, and stores the linked information in the RAM  152 . A target period for which points issued to a user are calculated and stored in a point memory may however be three months before a last-past month or six months before a last-past month, as well as may be another period such as 30 days before the previous day or 60 days before the previous day. 
     (2) In the embodiment described above, the CPU  151  of the point management server  100  links the point information Ip to identification information on the user, and manages points indicated by the point information Ip (see  FIG. 1 ). Such an aspect can however be applied that a point management unit links point information to a vehicle supplied with hydrogen, and stores in a point memory and manages the linked point information, similar to the embodiments described above. In the hydrogen gas supply facility  200  and the service management device  300 , identification information on a vehicle may be obtained through, for example, optical reading of a car registration plate of the vehicle, or obtained when a controller of the vehicle externally sends the identification information on the vehicle. 
     With such an aspect, an aspect of utilizing a pay parking lot in one of the embodiments described above can be controlled per vehicle. As well as, for example, when an insurance rate for the vehicle is determined or when the vehicle is sold, the insurance rate or a price of the vehicle can be determined by taking into account a number of points linked to the vehicle. Even points linked to a user can be taken into account when an insurance rate is determined or when a vehicle is sold. 
     (3) Such an aspect can be applied that a point management system does not calculate points issued during a predetermined period to a user. For example, such an aspect can be applied that points issued during a predetermined period to a user are calculated by the controller  450  of the hydrogen vehicle  400 , and the calculated points are stored in the RAM  452  to allow components of a hydrogen management system to utilize the points. 
     B10. Another Embodiment 10 
     In the embodiment described above, when the hydrogen vehicle  400  moves off the pay parking lot P 0 , the CPU  351  of the service management device  300  calculates points to be subtracted from points possessed by a user in accordance with provision of a parking space to the user (see  FIGS. 1 and 5 ). The CPU  351  links the changed-point information ΔIp of the points used, which indicates points to be subtracted, to identification information on the user, and sends the linked information, via the communication interface  364 , to the point management server  100 . Such an aspect can however be applied that a service management system does not perform such processing. For example, such processing may be performed by the controller  450  of the hydrogen vehicle  400 . 
     B11. Another Embodiment 11 
     The CPU  351  of the service management device  300  does not permit a user having a smaller number of points issued in a previous month than a threshold to park a vehicle in one of some of parking spaces, i.e., the parking spaces P 11  to P 13  and P 21  to P 23  (see  FIGS. 1 and 5 ). On the other hand, a user having a greater number of points issued in a previous month than the threshold is permitted to park a vehicle in one of the parking spaces P 11  to P 13  and P 21  to P 23 . 
     Such an aspect can however be applied that a service management system does not make such separation, but provides services to a user without any exception regardless of a number of points issued during a predetermined period to the user. Such an aspect can be applied that, in accordance with a number of points issued during a predetermined period to a user, a number of points to be subtracted is changed, and services are provided. Such an aspect can be applied that, for a user having a greater number of points issued during a predetermined period than the threshold, a lesser number of points is subtracted, compared with a user having a smaller number of points issued during the predetermined period than the threshold. 
     In addition to provision of parking spaces, services to be provided to users may take various aspects such as additional provision of a product. Such an aspect can be applied that, in car-sharing, for example, the higher the number of points issued during a predetermined period to a user, the higher the priority in allocation of a vehicle. 
     The present disclosure is not limited to the embodiments described above, and can be implemented in various ways without departing from the scope of the present disclosure. For example, the technical features of any of the above embodiments corresponding to the technical features of each of the aspects described in Summary may be replaced or combined appropriately, in order to solve part or all of the problems described above or in order to achieve part or all of the advantageous effects described above. Any of the technical features may be omitted appropriately unless the technical feature is described as essential in the description hereof. 
     B12. Another Embodiment 12 
     The disclosure is not limited to any of the embodiment and its modifications described above but may be implemented by a diversity of configurations without departing from the scope of the disclosure. For example, the technical features of any of the above embodiments and their modifications may be replaced or combined appropriately, in order to solve part or all of the problems described above or in order to achieve part or all of the advantageous effects described above. Any of the technical features may be omitted appropriately unless the technical feature is described as essential in the description hereof. The present disclosure may be implemented by aspects described below. 
     (1) According to an aspect of the present disclosure, a hydrogen gas supply system that supplies hydrogen gas to a user is provided. The hydrogen gas supply system comprises a storing unit that stores hydrogen, a communication unit that receives at least either of burden information indicative of an environmental burden exerted during manufacturing of hydrogen externally received by the storing unit and quality information indicative of quality with respect to the hydrogen externally received by the storing unit, a user interface unit that provides an output in accordance with the at least either of the burden information and the quality information with respect to the hydrogen supplied from the storing unit to the user, and a controller that controls the user interface unit based on an amount of the hydrogen received by the storing unit and the at least either of the burden information and the quality information, which is received by the communication unit. 
     With the aspect described above, a user can utilize information generated based on at least either of an environmental burden exerted during manufacturing of hydrogen stored in the storing unit and quality of the hydrogen, which is output from the user interface unit, to determine whether to accept supply of the hydrogen. 
     (2) In the hydrogen gas supply system according to the aspect described above, such an aspect is possible that the burden information includes information at least separately indicative of hydrogen obtained by allowing fossil fuel and water to react with each other, and hydrogen obtained by allowing water to undergo electrolysis with electric power obtained by utilizing natural energy. 
     With the aspect described above, such a user can be satisfied who willingly accepts supply of, instead of hydrogen obtained by allowing fossil fuel and water to react with each other, hydrogen obtained by allowing water to undergo electrolysis with electric power obtained by utilizing natural energy. 
     (3) In the hydrogen gas supply system according to the aspect described above, such an aspect is possible that the controller includes a memory configured to store the burden information of the hydrogen related to information on an amount of the hydrogen. The controller is configured to accept, from the user, via the user interface unit, before the hydrogen is supplied from the storing unit to the user, designation of the environmental burden with respect to the hydrogen to be supplied to the user, and update, based on the designated environmental burden and an amount of the hydrogen supplied from the storing unit to the user, the burden information linked to the information on the amount of the hydrogen and stored in the memory. 
     With the aspect described above, a user can designate, before accepting supply of hydrogen, for example, as hydrogen to be supplied, hydrogen that has exerted a smaller environmental burden during manufacturing to urge an administrator of a hydrogen gas supply system to utilize hydrogen that has exerted a smaller environmental burden. 
     (4) In the hydrogen gas supply system according to the aspect described above, such an aspect is possible that the controller is configured to send, to another hydrogen gas supply system via the communication unit, information including at least some of the burden information related to the information on the amount of the hydrogen in the memory, with information on an amount of hydrogen linked, and update the burden information related to the information on the amount of the hydrogen in the memory, based on the information including the at least some of the burden information sent to the other hydrogen gas supply system and the information on the amount of the hydrogen linked. 
     With the aspect described above, separately from burden information with respect to hydrogen actually received by the storing unit, burden information with respect to hydrogen can be sent to another hydrogen gas supply system. Without actually moving hydrogen, supply of hydrogen that has exerted a smaller environmental burden can be facilitated as a whole among a plurality of hydrogen gas supply systems. 
     (5) In the hydrogen gas supply system according to the aspect described above, such an aspect is possible that the controller is further configured to receive, from another hydrogen gas supply system via the communication unit, information including at least some of the burden information related to information on an amount of hydrogen, and update the burden information stored in the memory, based on the information including the at least some of the burden information and the information on the amount of the hydrogen received from the other hydrogen gas supply system. 
     With the aspect described above, separately from burden information with respect to hydrogen actually received by the storing unit, burden information with respect to hydrogen can be shared among the plurality of hydrogen gas supply systems. Without actually moving hydrogen, supply of hydrogen that has exerted a smaller environmental burden can be facilitated as a whole among a plurality of hydrogen gas supply systems. 
     (6) In the hydrogen gas supply system according to the aspect described above, such an aspect is possible that the controller further configured to disallow a point exchangeable with at least a part of a product or a service to be issued to a user who has designated a first environmental burden as the environmental burden of the hydrogen to be supplied to accept supply of the hydrogen, and allow the point to be issued, via the communication unit, to a user who has designated a second environmental burden lower than the first environmental burden as the environmental burden of the hydrogen to be supplied to accept supply of the hydrogen. 
     With the aspect described above, a user can beneficially designate, as an environmental burden with respect to hydrogen to be supplied, a smaller environmental burden. This urges a user to utilize hydrogen that has exerted a smaller environmental burden. 
     (7) According to another aspect of the present disclosure, a point management system that manages a point to be issued by the hydrogen gas supply system according to the aspect described above is provided. The point management system comprises a point memory that stores information on the point related to a user for which the point is issued, a point communication unit that receives, from the hydrogen gas supply system, the information on the point issued to the user, and a point management unit that adds, based on the information on the issued point, the issued point to points indicated by the point information related to the user in the point memory. The point management unit outputs the point information linked to the user and stored in the point memory, via the point communication unit, in accordance with an external request. 
     With the aspect described above, a user can beneficially designate hydrogen that has exerted a smaller environmental burden, and can be supplied with the hydrogen. This urges a user to utilize hydrogen that has exerted a smaller environmental burden. 
     (8) In the point management system according to the aspect described above, such an aspect is possible that the point management unit is further configured to externally receive point information on used points, which is related to a user, via the point communication unit, and subtract the used points from points indicated by the point information related to the user in the point memory. 
     With the aspect described above, a user can obtain benefits in accordance with an amount of supplied hydrogen that has exerted a smaller environmental burden. This urges a user to utilize hydrogen that has exerted a smaller environmental burden. 
     (9) In the point management system according to the aspect described above, such an aspect is possible that the point management unit further configured to calculate points issued to a user during a predetermined period, and store in the point memory the points related to the user, and output information on the points issued during the period to the user, which is stored in the point memory related to the user, in accordance with an external request, via the point communication unit. 
     With the aspect described above, a service or a product can be provided to a user in accordance with a point issued during a predetermined period to the user. 
     (10) According to still another aspect of the present disclosure, a service management system that manages provision of at least either of a service and a product is provided. The service management system comprises a service management unit that calculates, in accordance with provision of at least either of a service and a product to a user, a point to be subtracted from points related to the user, and a service communication unit that send information indicative of the used points to be subtracted related to the user to the point management system according to the aspect described above. 
     With the aspect described above, a user can obtain a service or a product in accordance with an amount of supplied hydrogen that has exerted a smaller environmental burden. This urges a user to utilize hydrogen that has exerted a smaller environmental burden. 
     (11) According to still another aspect of the present disclosure, a service management system that manages provision of at least either of a service and a product is provided. The service management system comprises a service communication unit configured to receive, from the point management system according to the aspect described above, information on points issued during the period to a user, and a service management unit that does not provide, to a user with a smaller number of points issued during the period to the user than a threshold, at least either of a service and a product determined beforehand, and provides, to a user with a greater number of points issued during the period to the user than the threshold, at least either of the service and the product. 
     With the aspect described above, a user can beneficially constantly receive supply of hydrogen that has exerted a smaller environmental burden. This further urges a user to utilize hydrogen that has exerted a smaller environmental burden. 
     The present disclosure can be implemented in various aspects other than those described above. For example, the present disclosure can be implemented in aspects of a method for supplying hydrogen gas, a method for managing points, and a method for managing services, as well as a method for controlling a hydrogen gas supply system, a point management system, or a service management system, a computer program achieving the control method, and a non-transitory storage medium recorded with the computer program.