To provide a portfolio construction support device capable of constructing a concrete portfolio from a plurality of merchandise items.

The portfolio construction support device 10 determines asset allocations on the basis of a plurality of prepared questions and answers and allocates input portfolio investments according to the asset allocations for different attributes of investments. The selection of a merchandise item from a plurality of kinds of merchandise prepared for the different attributes of investments is accepted, and the investments allocated to the different attributes of investments are further allocated to the different kinds of merchandise. Next, the individual stock of each merchandise item is displayed and the selection of individual stocks to be incorporated and the designation of investments are accepted. The investments are completely allocated to the individual stocks through these procedures to construct a concrete portfolio.