1. A transmission controlling apparatus comprising:a transmitting and receiving interface connected to a plurality of wireless stations each of which wirelessly transmits a signal; and
a processor connected to the memory and to the transmitting and receiving interface, wherein
the processor executes a process including:
calculating, for each of the wireless stations, an index indicating a magnitude of interference suffered by the signal wirelessly transmitted from the wireless station, the interference being caused by the signals wirelessly transmitted from one or more other wireless stations;
determining a resource to be allocated to each of the plurality of wireless stations in accordance with the index calculated for each of the wireless stations; and
transmitting transmission data to each of the plurality of wireless stations by using the determined resource, wherein
the determining includes allocating signal lines in such a manner that the greater interference a wireless station is indicated to suffer from by the calculated index, the larger number of signal lines are allocated to the wireless station, from among a plurality of signal lines connecting the transmitting and receiving interface to the wireless station.