TAC CO., LTD. is primarily engaged in providing educational services. The Individual Education segment provides exam preparation for certification examinations such as certified public accountant, tax account, real estate appraiser, certified social insurance labor consultant, securities analyst, information technology engineer and others. The Corporate Training segment is engaged in providing training and courses on certification acquisition and others for corporations, colleges, vocational schools, accounting firms and others, in providing study materials and consulting service, in selling tax filling software, in deploying partner schools and other business. The Publishing segment is engaged in publishing a lineup of educational books. The Human Resources segment is engaged in providing personnel placement and staffing services, and operating job site over the Internet.