At oneof formof electronic commerce (EC), it is transaction between enterprise (business). Transaction of enterprise and the general consumerB to C, calls the transaction of the generalconsumer Cto C.

In the amount base as for the majority of the electronic commerce markets it is said that B to B has occupied. From goods sale of the office supplies andthe personal computerand the book etc. of sentence tool and the like, service such as arrangement of the aeronautical ticket and reservation of the hotel, it diverges, the field which such as supply is included in B to B and talent mediation of the part and the raw materials etc.. The new enterprise where recently, it is called ASP which rents the application software for businessviathe Websightand Internet which are calledthe vertical portal whichoffers the transactionmarketto industry of specification attracts attention.