1. A quality control apparatus, comprising: a first extracting unit that extracts, from a time series distribution of troubles that have occurred in electronic equipments, a first characteristics of states of occurrence of the troubles; a part specifying unit that specifies one or more parts included in the electronic equipments, the parts being involved with the troubles; a second extracting unit that extracts, from another time series distribution of a rate of use corresponding to each of suppliers which supply the parts specified by the part specifying unit, a second characteristics of the parts; and a part supplier specifying unit that specifies one or more of the suppliers supplying the parts correlated to the troubles based on a correlation between the first characteristics extracted by the first extracting unit and the second characteristics extracted by the second extracting unit.