A control apparatus includes a calculation unit configured to calculate, for each of radio apparatuses, a combination of a pre-coding weight and a post-coding weight using a first channel information matrix based on estimated values of channel responses between each of the radio apparatuses and each of terminals, a selection unit configured to select one combination from the combinations calculated using the first channel information matrices as a first combination, and an orthogonalization unit configured to generate a second channel information matrix for each of the radio apparatuses by projecting each first channel information matrix onto the subspace that is orthogonal to the post-coding weight included in the first combination. The calculation unit calculates a combination for each of the radio apparatuses using a second channel information matrix, and the selection unit selects one combination from the combinations calculated using the second channel information matrix as a second combination.