Patent Number: 
Section: claims

1. An abnormality determining apparatus comprising:an information obtaining unit that obtains a plurality of various types of information relating to a detection subject;an information storage unit that stores therein a set information group formed of an aggregate of pieces of set information, which is a combination of the various types of information;a determining unit that determines presence of abnormality in the detection subject based on the set information group stored in the information storage unit and the various types of information obtained by the information obtaining unit;an initial operation period detecting unit that detects whether an initial operation period, which is a period from start of use of the detection subject after factory shipment until a predetermined period, has elapsed; andan information input unit that inputs maintenance completion information indicative of completion of maintenance of the detection subject; anda controlling unit that performs a process for storing the set information obtained by the information obtaining unit during the initial operation period in the information storage unit as a part of the set information group and upon the initial operation period detecting unit detecting elapsing of the initial operation period, performs a process for storing the set information obtained by the information obtaining unit in a predetermined period after input of the maintenance completion information additionally in the information storage unit as a part of the set information group, based on the input of the maintenance completion information to the information input unit. 2. The abnormality determining apparatus according to claim 1, wherein the set information input to the information input unit is additionally stored in the information storage unit as a part of the set information group. 3. The abnormality determining apparatus according to claim 1, wherein when at least one of the various types of information obtained by the information obtaining unit exceeds or falls below a predetermined threshold, storage of the set information obtained at that time as a part of the set information group is suspended. 4. The abnormality determining apparatus according to claim 3, wherein when at least one of the various types of information exceeds or falls below the predetermined threshold, storage of the set information stored in a predetermined period going back from that time as a part of the set information group is also suspended. 5. The abnormality determining apparatus according to claim 1, wherein when abnormality occurrence information is input to the information input unit, the set information stored in a predetermined period going back from the input timing of the abnormality occurrence information is removed from the set information group. 6. The abnormality determining apparatus according to claim 1, wherein during the initial operation period or in a period when the set information additional storing process is performed, the presence of abnormality in the detection subject is determined by the determining unit based on the set information group stored in the information storage unit and the set information obtained by the information obtaining unit, and when there is an abnormality, this matter is notified by a notification unit, and thereafter, it is determined whether to store the set information as a part of the set information group based on the abnormality presence information input to the information input unit. 7. The abnormality determining apparatus according to claim 6, wherein a determination criterion for the presence of abnormality is changed with an increase in the number of set information in the set information group. 8. The abnormality determining apparatus according to claim 6, wherein termination timing of the initial operation period or a period during which the set information additional storing process is performed is determined based on the number of inputs per unit time of erroneous determination information indicating that there is erroneous determination regarding the presence of abnormality, performed in the initial operation period or the period during which the set information adding/storing process is performed, with respect to the information input unit. 9. The abnormality determining apparatus according to claim 1, further comprising a trial run detector that detects a trial run of the detection subject performed under a predetermined condition, and a trial run frequency calculation unit that calculates cumulative frequency of the trial run. 10. An image forming apparatus as a detection subject comprising an image forming unit that forms an image on a recording medium and an abnormality determining unit that determines presence of abnormality in the detection subject, wherein the abnormality determining apparatus according to claim 1 is used as the abnormality determining unit. 11. The abnormality determining apparatus according to claim 1, wherein the maintenance completion information is input to the information input unit when there is no abnormality in the detection subject. 12. The abnormality determining apparatus according to claim 1, wherein the determining unit does not determine presence of abnormality in the detection subject during the initial operation period or in the predetermined period after input of the maintenance completion information. 13. An abnormality determining apparatus comprising:an information obtaining unit that obtains a plurality of various types of information relating to a detection subject;an information storage unit that stores therein a set information group formed of an aggregate of pieces of set information, which is a combination of the various types of information;a determining unit that determines presence of abnormality in the detection subject based on the set information group stored in the information storage unit and the various types of information obtained by the information obtaining unit;an initial operation period detecting unit that detects whether an initial operation period, which is a period from start of use of the detection subject after factory shipment until a predetermined period, has elapsed;an information input unit that inputs checked normal information indicating that no abnormality was found when the detection subject was checked; anda controlling unit that performs a process for storing the set information obtained by the information obtaining unit during the initial operation period in the information storage unit as a part of the set information group, wherein the set information obtained by the information obtaining unit after the initial operation period has passed is stored in the information storage unit separately from the set information group, and when there is an input of the checked normal information, additionally stores the set information stored separately from the set information group since the initial operation period has passed until the input of the checked normal information as a part of the set information group. 14. The abnormality determining apparatus according to claim 13, wherein the set information input to the information input unit is additionally stored in the information storage unit as a part of the set information group. 15. The abnormality determining apparatus according to claim 13, wherein when at least one of the various types of information obtained by the information obtaining unit exceeds or falls below a predetermined threshold, storage of the set information obtained at that time as a part of the set information group is suspended. 16. The abnormality determining apparatus according to claim 15, wherein when at least one of the various types of information exceeds or falls below the predetermined threshold, storage of the set information stored in a predetermined period going back from that time as a part of the set information group is also suspended. 17. The abnormality determining apparatus according to claim 13, wherein when abnormality occurrence information is input to the information input unit, the set information stored in a predetermined period going back from the input timing of the abnormality occurrence information is removed from the set information group. 18. The abnormality determining apparatus according to claim 13, wherein during the initial operation period or in a period when the set information additional storing process is performed, the presence of abnormality in the detection subject is determined by the determining unit based on the set information group stored in the information storage unit and the set information obtained by the information obtaining unit, and when there is an abnormality, this matter is notified by a notification unit, and thereafter, it is determined whether to store the set information as a part of the set information group based on the abnormality presence information input to the information input unit. 19. The abnormality determining apparatus according to claim 18, wherein a determination criterion for the presence of abnormality is changed with an increase in the number of set information in the set information group. 20. The abnormality determining apparatus according to claim 18, wherein termination timing of the initial operation period or a period during which the set information additional storing process is performed is determined based on the number of inputs per unit time of erroneous determination information indicating that there is erroneous determination regarding the presence of abnormality, performed in the initial operation period or the period during which the set information adding/storing process is performed, with respect to the information input unit. 21. The abnormality determining apparatus according to claim 13, further comprising a trial run detector that detects a trial run of the detection subject performed under a predetermined condition, and a trial run frequency calculation unit that calculates cumulative frequency of the trial run. 22. An image forming apparatus as a detection subject comprising an image forming unit that forms an image on a recording medium and an abnormality determining unit that determines presence of abnormality in the detection subject, wherein the abnormality determining apparatus according to claim 13 is used as the abnormality determining unit.