9. The searching device according to claim 5 , further comprising: a count unit counting the number of the same facility information as facility information stored in said storage unit by said history storing unit; and a weight storage unit storing a weight based on the number counted by the count unit, by associating the weight with facility information, wherein said extraction unit extracts facility information corresponding to the previous searching keyword and the facility information or attribute received by said reception unit, by referring to the previous searching keyword that is obtained after changing by said change unit, the facility information and the attribute that are stored in said storage unit, as well as said weight associated with the facility information stored by said weight storage unit.
11. The searching device according to claim 9 , further comprising an extraction number counting unit counting the number of extraction times facility information is extracted by said extraction unit, wherein said weight storage unit stores, in association with facility information, a weight based on the number counted by said count unit and the extraction number counted by said extraction number counting unit.