利用自動販賣機與網路購物乃為現代社會常用之交易方式。此二種交易方式雖然不算新興，但民法在制定時並未考量此類交易形態而加以規範，故在其法律關係上，學說百家爭鳴。各家見解主要將設置行為分為要約引誘或要約，理由各有所長，亦有所缺，乃肇因於販賣機與網頁設計之複雜性，難以用同一理論貫徹之。本文主要係再檢視民法第154條第2項之規定，並試圖提出其他看法以為補充，以期讓實務操作時能夠更為靈活運用。

Buy from vending machines and online shopping were commonly used in the mordern society. These two types are not new, but not yet included in our civil law and clearly defined. Therefore, they are very disputed. Two main insights about the settings of the machine and buying websites are the opinions, either call for proposals to offer or offer. Your arguments are justified differently. Of course, they have advantages and disadvantages. Variety of machine settings of machines and complexity of design of the online shopping store cause such varied opinions, and can not prevail by only one theory of legal relationship. This work was owed primarily to the view of the Act. 154 II BGB, and complements other opinions, that they might choose flexible in practice.