The renting or purchasing real estate decision support computer system [to] be. The renting or purchasing real estate decision support computer system [a], a search condition reception means, the one or more real estate 1 satisfying the retrieval condition specifying means, one or more real estate information indicating the specified 1 presenting means. The one or more real estate 1 is specified, the specified one or more of real estate to purchase or rental service for determining support 1 may be imparted. The search conditions, one or more subjective theme comprises 1, the specifying means specifies, based on one or more subjective theme 1 included in the search condition, the search results are presented as one or more of real estate can be specified to be 1. By this computer system, renting or purchasing real estate decision support is achieved. [Drawing] Figure 1D